Software supply chain attacks have grown in both frequency and sophistication. Recent high-profile compromises of build systems and open source dependencies demonstrate that attackers increasingly target the trust mechanisms that verify software integrity. Those trust mechanisms rely on digital signature algorithms, and today many use traditional algorithms such as Rivest-Shamir-Adleman (RSA) and the Elliptic Curve Digital Signature Algorithm (ECDSA). If a sufficiently powerful quantum computer could forge these signatures, an attacker could potentially inject unauthorized code into signed artifacts, fabricate build attestations, or impersonate legitimate publishers. Using quantum-resistant signatures today defends against threats that might emerge in the future.

Since 2025, the Commercial National Security Algorithm Suite 2.0 (CNSA 2.0), published by the US National Security Agency (NSA), has required US National Security Systems (NSS) to “support and prefer” quantum-resistant signatures for software and firmware, with exclusive use mandated by 2030. The EU Cyber Resilience Act (CRA) takes full effect in December 2027. It requires manufacturers to maintain verifiable software integrity throughout a product’s lifecycle. Organizations that ship software to US federal agencies or sell products in the European market face converging deadlines that demand action now.

Amazon Web Services (AWS) provides the building blocks to construct a quantum-resistant software supply chain today using production-ready, generally available services. In this post, I show you how to combine Module-Lattice-Based Digital Signature Algorithm (ML-DSA) keys in AWS Key Management Service (AWS KMS), ML-DSA certificate hierarchies in AWS Private Certificate Authority, and ML-DSA trust anchors in AWS Identity and Access Management (IAM) Roles Anywhere into an end-to-end signing architecture for binaries, container images, and software bills of materials (SBOMs).

This post is Part 1 of a two-part series on adopting ML-DSA signatures, standardized in NIST FIPS 204 (ML-DSA) signatures, on AWS. As of Oct 2026, this series is the first end-to-end guide from any cloud provider for post-quantum signing across the software supply chain, from establishing an ML-DSA root of trust to enforcing algorithm policy across an organization. This part is for builders and walks through constructing and operating the signing pipeline. Part 2, Enforce your ML-DSA algorithm policy with SCPs and IAM, is for security and governance teams and shows how to turn the algorithm choices made here into preventive and detective controls across an organization.

After a cryptographically relevant quantum computer (CRQC) exists, the mathematical problems protecting today’s public-key cryptography can be solved efficiently. Attacks that are impractical today because of the computational complexity suddenly become practical using a CRQC. Most discussions of post-quantum cryptography (PQC) focus on the harvest now, decrypt later threat to data confidentiality. The asymmetric keys protecting data in transit can be efficiently derived using a CRQC, exposing the data that was meant to be protected. Digital signatures rely on the same asymmetric mathematical problems that a CRQC would break. This means that software supply chains face a parallel threat that targets integrity rather than confidentiality. An attacker who records signed artifacts today can forge those signatures in the future on a totally different artifact, using a CRQC.

Consider firmware signed with ECDSA P-256 and deployed to a fleet of embedded devices in 2026. These devices verify the firmware signature on every boot for their 15-year operational lifetime and can’t be recalled to re-sign after deployment. If a CRQC becomes operational in 2035, an attacker could produce a valid-looking signature over tampered firmware, and every device in the fleet would accept it as authentic on next restart. For organizations that rely on classical digital signatures as the primary mechanism for verifying software integrity, this weakens a critical link in the verification chain. This is why CNSA 2.0 specifies aggressive timelines for digital signatures: the artifacts you sign today must remain trustworthy for their full operational lifetime.

ML-DSA is designed to resist attacks from both classical and quantum computers. AWS KMS, AWS Private CA, and AWS IAM Roles Anywhere all support ML-DSA, making it possible to address the forge-later threat across your supply chain today without additional tooling.

The architecture comprises five trust pillars that together protect your software delivery pipeline:

1. ML-DSA key management in AWS KMS – All signing keys are generated and protected in FIPS 140-3 Security Level 3 hardware security modules (HSMs). Private keys never leave the HSM boundary.
2. ML-DSA public key infrastructure (PKI) through AWS Private CA – A certificate hierarchy (root CA, subordinate CA, end-entity certificates) binds ML-DSA public keys to identities, establishing who signed what. CA private keys are generated and stored in hardware-protected HSMs managed by the service and never leave the HSM boundary.
3. Quantum-resistant workload identity (for external build agents) – For continuous integration and delivery (CI/CD) agents running outside AWS that authenticate through X.509 certificates, IAM Roles Anywhere with ML-DSA certificates ties the signer’s identity back to the same quantum-resistant root of trust.
4. ML-DSA artifact signing – Build outputs (binaries, container image manifests, packages) are signed using AWS KMS ML-DSA keys. Signatures are stored alongside artifacts in Amazon Simple Storage Service (Amazon S3) or Amazon Elastic Container Registry (Amazon ECR).
5. ML-DSA SBOM integrity attestation – The SBOM for each release is wrapped in an in-toto Statement that names the artifact it describes by digest, and the Statement is signed with the same ML-DSA code-signing key. This provides quantum-resistant proof that the dependency manifest hasn’t been tampered with and that it belongs to the artifact it accompanies.

These pillars create a chain of trust: AWS Private CA protects the root CA key in its own HSMs, issues certificates that bind identities to AWS KMS code-signing keys, IAM Roles Anywhere uses those certificates to authenticate build agents, and authenticated agents sign every artifact and SBOM they produce.

Figure 1: End-to-end quantum-resistant software supply chain on AWS

Figure 1 illustrates this architecture in four layers, numbered in the order you build them:

1. Root of trust (Pillars 1 and 2) – Establish your AWS Private CA hierarchy and create your code-signing key in AWS KMS.
2. Workload identity (Pillar 3) – Register the CA as an IAM Roles Anywhere trust anchor and issue ML-DSA certificates to build agents, ensuring the signer’s identity chains back to the same quantum-resistant root of trust.
3. Artifact signing (Pillars 4 and 5) – Sign binaries, container images, and SBOMs using the authenticated build agent.
4. Verification and enforcement – Validate signatures at deployment and enforce ML-DSA-only policies.

To follow along, you need:

• An AWS account with permissions to create resources in AWS KMS, AWS Private CA, IAM Roles Anywhere, and Amazon ECR.
• AWS Command Line Interface (AWS CLI) v2 configured with appropriate credentials.
• IAM Roles Anywhere credential helper (aws_signing_helper) v1.8.0 or later, the first release that supports ML-DSA keys and certificates, for workload authentication. Download from the IAM Roles Anywhere documentation.
• OpenSSL 3.5 or later (required for ML-DSA signature verification and mu computation).
• ORAS CLI v1.2 or later (for attaching Open Container Initiative (OCI) referrer artifacts to container images). Alternatively, you can use the Notation CLI with a custom plugin or any OCI-compliant client that supports the OCI Referrers API.
• jq, for constructing and parsing the in-toto Statements used for SBOM attestation and for parsing ORAS output.
• Amazon Inspector SBOM Generator (Sbomgen), or another tool that produces a CycloneDX JSON SBOM, for the SBOM example. Sbomgen runs only on Linux (x86-64 and ARM64), so run that step on a Linux build agent or container. It uses the registry credentials that oras login stores in the Docker config file, and it also accepts them through --username or the INSPECTOR_SBOMGEN_USERNAME and INSPECTOR_SBOMGEN_PASSWORD environment variables.
• Java 11 or later and Apache Maven, to run the diy-code-signing-kms-private-ca sample that produces the code-signing CSR in Step 4 of Building the ML-DSA PKI foundation.
• A container image pushed to Amazon ECR (for the container signing example).

Start by creating the certificate hierarchy that will anchor your supply chain trust. AWS Private CA generates and stores its own CA signing keys internally in hardware-protected HSMs when you create a certificate authority. Use ML-DSA-87 (NIST security category 5, defined as at least as hard to break as exhaustive key search on AES-256) for the root CA because it protects the longest-lived trust anchor. Use ML-DSA-65 (NIST security category 3) for the subordinate CA to balance security with smaller signature sizes for frequently issued certificates.

The parameter sets used here, ML-DSA-87 and ML-DSA-65, are also the approved set in the example algorithm policy that Part 2 of this series turns into enforceable controls. If your organization has standardized on a different set, substitute it in the commands that follow; the build steps don’t change.

Step 1: Create the root CA in AWS Private CA

When you specify KeyAlgorithm: ML_DSA_87, Private CA generates an ML-DSA-87 key pair internally. You don’t need to create a separate AWS KMS key for the CA.

aws acm-pca create-certificate-authority \
  --certificate-authority-configuration '{
    "KeyAlgorithm": "ML_DSA_87",
    "SigningAlgorithm": "ML_DSA_87",
    "Subject": {
      "CommonName": "PQC Supply Chain Root CA",
      "Organization": "Example Corp",
      "Country": "US"
    }
  }' \
  --certificate-authority-type ROOT

After creation, the root CA is in PENDING_CERTIFICATE state. Activate it by self-signing its certificate. This is where you set the root CA’s validity period (10 years is typical for a root):

# Retrieve the root CA's CSR
aws acm-pca get-certificate-authority-csr \
  --certificate-authority-arn <root-ca-arn> \
  --output text > root-ca.csr

# Self-sign the root CA certificate (valid for 10 years)
ROOT_CERT_ARN=$(aws acm-pca issue-certificate \
  --certificate-authority-arn <root-ca-arn> \
  --csr fileb://root-ca.csr \
  --signing-algorithm ML_DSA_87 \
  --validity Value=3650,Type=DAYS \
  --template-arn arn:aws:acm-pca:::template/RootCACertificate/V1 \
  --query CertificateArn --output text)

# Retrieve and install the self-signed root certificate
aws acm-pca get-certificate \
  --certificate-authority-arn <root-ca-arn> \
  --certificate-arn $ROOT_CERT_ARN \
  --query Certificate --output text > root-ca-cert.pem

aws acm-pca import-certificate-authority-certificate \
  --certificate-authority-arn <root-ca-arn> \
  --certificate fileb://root-ca-cert.pem

Step 2: Create a subordinate CA for code signing

aws acm-pca create-certificate-authority \
  --certificate-authority-configuration '{
    "KeyAlgorithm": "ML_DSA_65",
    "SigningAlgorithm": "ML_DSA_65",
    "Subject": {
      "CommonName": "PQC Code Signing CA",
      "Organization": "Example Corp",
      "Country": "US"
    }
  }' \
  --certificate-authority-type SUBORDINATE

After creation, the subordinate CA enters PENDING_CERTIFICATE state with no link to the root. Activate it by signing its certificate signing request (CSR) with the root CA:

# Retrieve the subordinate CA's certificate signing request
aws acm-pca get-certificate-authority-csr \
  --certificate-authority-arn <sub-ca-arn> \
  --output text > sub-ca.csr

# Sign the CSR using the root CA (this establishes the trust hierarchy)
SUB_CERT_ARN=$(aws acm-pca issue-certificate \
  --certificate-authority-arn <root-ca-arn> \
  --csr fileb://sub-ca.csr \
  --signing-algorithm ML_DSA_87 \
  --validity Value=1825,Type=DAYS \
  --template-arn arn:aws:acm-pca:::template/SubordinateCACertificate_PathLen0/V1 \
  --query CertificateArn --output text)

# Retrieve the signed certificate and import it to activate the subordinate CA
aws acm-pca get-certificate \
  --certificate-authority-arn <root-ca-arn> \
  --certificate-arn $SUB_CERT_ARN \
  --query Certificate --output text > sub-ca-cert.pem

aws acm-pca import-certificate-authority-certificate \
  --certificate-authority-arn <sub-ca-arn> \
  --certificate fileb://sub-ca-cert.pem \
  --certificate-chain fileb://root-ca-cert.pem

Step 3: Create the code-signing key in AWS KMS

Your build agents use this key to sign artifacts, so their IAM roles need the kms:Sign permission on it. The end-entity certificate issued by your subordinate CA binds an identity to this key’s public key.

aws kms create-key \
  --key-spec ML_DSA_65 \
  --key-usage SIGN_VERIFY \
  --description "PQC code-signing key for supply chain" \
  --tags TagKey=Purpose,TagValue=CodeSigning

Create an alias for convenient reference in your CI/CD scripts:

aws kms create-alias \
  --alias-name alias/pqc-code-signing \
  --target-key-id <key-id-from-above>

Step 4: Issue the end-entity code signing certificate

To issue a certificate, you need a CSR. Because the ML-DSA private key never leaves the AWS KMS HSM, you can’t generate the CSR locally with OpenSSL. Instead, you construct the CSR’s TBS (to-be-signed) structure containing your subject name and public key, sign it remotely by calling aws kms sign, and assemble the final CSR from those components.

For a working implementation that assembles an ML-DSA CSR around a KMS-managed private key and signs it with AWS KMS, see Post-quantum (ML-DSA) code signing with AWS Private CA and AWS KMS and its diy-code-signing-kms-private-ca sample on GitHub (Java, built with Maven). There is no AWS CLI-only path for this step: the CSR must be constructed and signed in code, and the sample is the reference implementation.

After you have the code-signing.csr file, issue the certificate from your subordinate CA:

# Issue a code-signing certificate valid for one year, signed by the subordinate CA using ML-DSA-65.
# Replace <sub-ca-arn> with the ARN that create-certificate-authority returned for the subordinate CA in Step 2.
CODE_SIGNING_CERT_ARN=$(aws acm-pca issue-certificate \
  --certificate-authority-arn <sub-ca-arn> \
  --csr fileb://code-signing.csr \
  --signing-algorithm ML_DSA_65 \
  --validity Value=365,Type=DAYS \
  --template-arn arn:aws:acm-pca:::template/CodeSigningCertificate/V1 \
  --query CertificateArn --output text)

# Retrieve the issued certificate
aws acm-pca get-certificate \
  --certificate-authority-arn <sub-ca-arn> \
  --certificate-arn $CODE_SIGNING_CERT_ARN \
  --query Certificate --output text > code-signing-cert.pem

This certificate binds the signer identity to the AWS KMS code-signing key material. Note that the certificate validity period (365 days in this example) determines how long verifiers can validate signatures by checking the certificate alone. AWS Private CA lets you choose the validity period of an issued certificate, as long as it ends no later than the issuing CA’s own certificate; in this example the subordinate CA certificate from Step 2 is valid for 1,825 days, so the three-year option below fits inside it. For artifacts that must remain verifiable beyond the certificate’s expiry, consider these approaches:

• Longer certificate validity – For private PKI, code-signing certificates are commonly issued with multi-year validity (for example, Value=1095,Type=DAYS for 3 years) because you control the issuance policy.
• Trusted timestamping (RFC 3161) – Countersign each signature with an RFC 3161 timestamp from a Time Stamping Authority (TSA) at signing time. The timestamp proves the signature was created while the certificate was valid, allowing verification indefinitely. AWS doesn’t provide a managed TSA; use a third-party TSA or operate your own.
• Re-signing – Before a certificate expires, re-sign active artifacts with a newly issued certificate.

Distribute the certificate chain (root CA certificate, subordinate CA certificate, and end-entity certificate) to systems that need to verify your signatures.

With the PKI hierarchy in place, integrate ML-DSA signing into your build process. The approach depends on artifact type. ML-DSA-65 signatures are 3,309 bytes (compared to 64 bytes for ECDSA P-256), and the latency of the AWS KMS Sign operation for ML-DSA is comparable to existing asymmetric operations. The larger signature size has negligible impact when stored alongside multi-megabyte container images or packages, but is worth accounting for in size-constrained environments like embedded device images transmitted over low-bandwidth links.

Most build outputs, including compiled binaries and packages, are far larger than the 4,096-byte limit that AWS KMS places on the message passed to aws kms sign. Make the EXTERNAL_MU method your pipeline’s default: compute the 64-byte message representative (mu) externally with OpenSSL 3.5, then pass only mu to AWS KMS. This handles an artifact of any size and never needs to change as your artifacts grow. AWS KMS also accepts content directly with --message-type RAW, up to 4,096 bytes. Use RAW only for inputs whose size is fixed by construction, such as the 71-character manifest digest in the container image example that follows. An artifact that fits today is likely to outgrow the limit later, and a pipeline that depends on RAW fails when it does. Both methods produce cryptographically identical signatures. The verifier doesn’t need to know which method was used; standard ML-DSA verification applies in either case.

# Retrieve the public key
aws kms get-public-key --key-id alias/pqc-code-signing \
  --query PublicKey --output text | base64 --decode > pk.der

# Extract raw public key bytes from the DER-encoded SubjectPublicKeyInfo.
# The BIT STRING starts at offset 17 for all ML-DSA key sizes. 
# Expected output: 1,312 bytes (ML-DSA-44), 1,952 bytes (ML-DSA-65), or 2,592 bytes (ML-DSA-87).

openssl asn1parse -inform DER -in pk.der -strparse 17 -noout -out pk_raw.bin

# Compute mu per FIPS 204 Section 6.2
printf '\x00\x00' | cat - artifact.bin > m_prime.bin
openssl dgst -shake256 -xoflen 64 -binary pk_raw.bin > pk_hash.bin
cat pk_hash.bin m_prime.bin | openssl dgst -shake256 -xoflen 64 -binary > mu.bin

# Sign the mu value
aws kms sign \
  --key-id alias/pqc-code-signing \
  --message fileb://mu.bin \
  --message-type EXTERNAL_MU \
  --signing-algorithm ML_DSA_SHAKE_256 \
  --query Signature --output text | base64 --decode > artifact.bin.sig

Store the .sig file alongside the artifact in Amazon S3 or your package repository. Protect the integrity of both the artifact and its signature by enabling S3 Object Lock (WORM protection) or at minimum S3 Versioning with restricted write access. If an attacker can modify or delete either file, verification can’t be trusted. For comprehensive guidance, see Security best practices for Amazon S3.

For container image signing, use the OCI referrer pattern, defined in the OCI Image and Distribution Specifications v1.1. A referrer is an artifact, such as a signature or an SBOM, whose manifest names another image in its subject field. Registries that support the pattern, including Amazon ECR, return these artifacts when a client asks for an image’s referrers. This approach uses AWS KMS ML-DSA keys to generate the signature and stores it as a referrer of the image:

# Repository URI used by ORAS here and in the SBOM steps; replace the account ID and Region
ECR_URI=111122223333.dkr.ecr.us-east-1.amazonaws.com/myapp

# Authenticate ORAS to Amazon ECR
aws ecr get-login-password --region us-east-1 | \
  oras login --username AWS --password-stdin 111122223333.dkr.ecr.us-east-1.amazonaws.com

# Get the image manifest digest
IMAGE_DIGEST=$(aws ecr batch-get-image \
  --repository-name myapp \
  --image-ids imageTag=v1.2.0 \
  --query 'images[0].imageId.imageDigest' --output text)

# Sign the digest. It is a fixed 71 characters, so RAW is safe here (see Binary and package signing).
# AWS CLI v2 expects blob parameters to be base64, so write the digest to a file and pass it with fileb://
echo -n "$IMAGE_DIGEST" > digest.txt
aws kms sign \
  --key-id alias/pqc-code-signing \
  --message fileb://digest.txt \
  --message-type RAW \
  --signing-algorithm ML_DSA_SHAKE_256 \
  --query Signature --output text | base64 --decode > image.mldsa.sig

# Attach signature as OCI referrer using ORAS
oras attach $ECR_URI@$IMAGE_DIGEST \
  --artifact-type "application/vnd.example.mldsa-signature.v1" \
  image.mldsa.sig:application/octet-stream

At deployment time, your admission controller retrieves the referrer artifact and verifies the ML-DSA signature before allowing the image to run. See Verifying a container image signature before deployment later in this post for the full verification workflow and admission control implementation.

A software bill of materials (SBOM) is a structured inventory of every component, library, and dependency included in a software release. It lists package names, versions, suppliers, and dependency relationships. Organizations use SBOMs to track vulnerabilities, verify license compliance, and respond quickly when a compromised component is disclosed.

Signing the SBOM file on its own proves that the inventory hasn’t been tampered with since it was signed, but not which artifact it describes. If the image signature and the SBOM signature are independent of each other, an attacker who holds a legitimately signed SBOM for a clean image can present it alongside a different signed image and claim that the two correspond. Attaching the SBOM to the image as an OCI referrer doesn’t close this gap by itself, because the subject field of a referrer manifest is set by whoever pushes the referrer; it’s a discovery mechanism, not a cryptographic binding. The binding must be inside the bytes that the signature covers.

To create that binding, wrap the SBOM in an in-toto Statement before signing it. A Statement names the artifacts it describes in its subject field, by digest, and carries the SBOM as its predicate. Because the image manifest digest is part of the signed content, a verifier can confirm that the SBOM in hand was issued for exactly the image it is about to deploy, and a swapped SBOM or a swapped digest fails verification. Embedding the SBOM in the image filesystem is another way to bind the two, because the image digest then covers the SBOM bytes. This post uses the Statement approach because it also works for SBOMs generated by scanning a finished image, for artifacts that have no filesystem such as binaries and firmware, and for images that are already in your registry, and because the SBOM stays readable from the registry without pulling the image.

Generate the SBOM with your preferred tool (such as Amazon Inspector SBOM Generator (Sbomgen) for container images), wrap it in a Statement, and sign the Statement with the same EXTERNAL_MU step you use for binaries:

# Scan the pushed image by digest so the inventory describes exactly the manifest you signed.
# Sbomgen reuses the registry login from the oras login step in the previous section.
inspector-sbomgen container --image $ECR_URI@$IMAGE_DIGEST -o sbom.json

# Wrap the SBOM in an in-toto Statement whose subject is the image manifest digest.
# This puts the digest inside the signed bytes, which binds this SBOM to this image.
jq -n \
  --arg name "$ECR_URI" \
  --arg digest "${IMAGE_DIGEST#sha256:}" \
  --slurpfile sbom sbom.json \
  '{
    "_type": "https://in-toto.io/Statement/v1",
    "subject": [{"name": $name, "digest": {"sha256": $digest}}],
    "predicateType": "https://cyclonedx.org/bom",
    "predicate": $sbom[0]
  }' > sbom.statement.json

# Sign using EXTERNAL_MU (same mu computation as binary signing above,
# with sbom.statement.json as the input)
# ... compute mu from sbom.statement.json ...
aws kms sign \
  --key-id alias/pqc-code-signing \
  --message fileb://mu.bin \
  --message-type EXTERNAL_MU \
  --signing-algorithm ML_DSA_SHAKE_256 \
  --query Signature --output text | base64 --decode > sbom.statement.json.sig

# Attach the Statement and its signature to the image as an OCI referrer so
# verifiers discover them alongside the image signature
oras attach $ECR_URI@$IMAGE_DIGEST \
  --artifact-type "application/vnd.example.mldsa-sbom-attestation.v1" \
  sbom.statement.json:application/vnd.in-toto+json \
  sbom.statement.json.sig:application/octet-stream

Ship the Statement and its .sig file together; the SBOM itself is the Statement’s predicate field, and verifiers extract it after verification. The same pattern binds an SBOM to a binary or package: set the subject digest to the SHA-256 of the file instead of an image manifest digest. The Verifying a binary or SBOM signature section later in this post walks through the full verification workflow, including the subject check that completes the binding.

Signing artifacts with ML-DSA keys addresses the integrity of the artifacts themselves. Separately, build agents running outside AWS (on-premises Jenkins, self-hosted GitHub Actions runners, or third-party CI/CD systems) authenticate using X.509 certificates or OIDC tokens typically signed with RSA or ECDSA. These authentication credentials represent a classical cryptographic dependency in the pipeline. IAM Roles Anywhere with ML-DSA certificates replaces that dependency: the credential that the external build agent presents, and the CA that vouches for it, no longer rely on algorithms that are vulnerable to quantum attack. (The TLS connection that carries the request still authenticates the AWS endpoint with a traditional certificate, as public TLS does today; that is a transport concern separate from the signing identity this post is about.) Build agents running on AWS with an attached IAM role don’t have this dependency: their API requests are authenticated with AWS Signature Version 4 (SigV4), which uses a symmetric hash-based message authentication code (HMAC-SHA256). Symmetric schemes like this are already considered quantum-resistant, so no additional action is needed.

Step 1: Register a workload identity CA as a trust anchor

For this walkthrough, reuse the subordinate CA that you created earlier; that avoids the monthly charge for a second CA, and the commands that follow assume it. In production, use a dedicated subordinate CA for workload identity certificates, separate from your code-signing CA. This limits the blast radius if either CA is compromised and has to be revoked, and it lets you apply different issuance policies to the two certificate types.

# Use the ARN that create-certificate-authority returned when you created the
# subordinate CA earlier. If you no longer have it, list your CAs and copy the
# ARN of the SUBORDINATE one.
aws acm-pca list-certificate-authorities \
  --query "CertificateAuthorities[?Type=='SUBORDINATE'].[Arn,Status,CertificateAuthorityConfiguration.Subject.CommonName]" \
  --output table
SUB_CA_ARN=arn:aws:acm-pca:us-east-1:111122223333:certificate-authority/abc-123   # replace with yours

# Register the subordinate CA as an IAM Roles Anywhere trust anchor
aws rolesanywhere create-trust-anchor \
  --name "PQC-CI-CD-Trust-Anchor" \
  --source "sourceType=AWS_ACM_PCA,sourceData={acmPcaArn=$SUB_CA_ARN}" \
  --enabled

Step 2: Create the build agent role and a profile that references it

An IAM Roles Anywhere profile specifies which IAM roles a workload can assume after it authenticates with a certificate from your trust anchor. Create the role first. Its trust policy lets IAM Roles Anywhere assume it only through your trust anchor and only for a certificate whose subject common name identifies the build agent; without those conditions, any certificate that the trust anchor CA issues could assume the role. Its permissions policy grants only what signing requires, on only the code-signing key. Save the trust policy as build-agent-trust.json, replacing the trust anchor ARN with the one that create-trust-anchor returned in Step 1:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {"Service": "rolesanywhere.amazonaws.com"},
      "Action": ["sts:AssumeRole", "sts:TagSession", "sts:SetSourceIdentity"],
      "Condition": {
        "ArnEquals": {
          "aws:SourceArn": "arn:aws:rolesanywhere:us-east-1:111122223333:trust-anchor/ta-id"
        },
        "StringEquals": {
          "aws:PrincipalTag/x509Subject/CN": "pqc-build-agent-01"
        }
      }
    }
  ]
}

Save the permissions policy as build-agent-permissions.json, replacing the resource with your key’s ARN (aws kms describe-key --key-id alias/pqc-code-signing --query KeyMetadata.Arn --output text):

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": ["kms:Sign", "kms:GetPublicKey", "kms:DescribeKey"],
      "Resource": "<code-signing-key-arn>"
    }
  ]
}

Create the role, attach the policy, and then create a profile that references the role:

aws iam create-role \
  --role-name PQCBuildAgentRole \
  --assume-role-policy-document file://build-agent-trust.json

aws iam put-role-policy \
  --role-name PQCBuildAgentRole \
  --policy-name pqc-code-signing \
  --policy-document file://build-agent-permissions.json

aws rolesanywhere create-profile \
  --name "PQC-Build-Agent-Profile" \
  --role-arns "arn:aws:iam::111122223333:role/PQCBuildAgentRole" \
  --enabled

Step 3: Issue the build agent certificate and configure the credential helper

Generate the build agent’s ML-DSA-65 key pair and CSR locally with OpenSSL, have the subordinate CA issue a client authentication certificate for it, and then configure the IAM Roles Anywhere credential helper to present that certificate:

# Generate the build agent's key pair and CSR. The CN must match the
# aws:PrincipalTag/x509Subject/CN condition in the role's trust policy.
openssl genpkey -algorithm ML-DSA-65 -out build-agent-mldsa-key.pem
chmod 400 build-agent-mldsa-key.pem
openssl req -new -key build-agent-mldsa-key.pem \
  -subj "/C=US/O=Example Corp/CN=pqc-build-agent-01" \
  -out build-agent.csr

# Issue a 30-day client authentication certificate from the subordinate CA
# registered as the trust anchor in Step 1.
BUILD_AGENT_CERT_ARN=$(aws acm-pca issue-certificate \
  --certificate-authority-arn $SUB_CA_ARN \
  --csr fileb://build-agent.csr \
  --signing-algorithm ML_DSA_65 \
  --validity Value=30,Type=DAYS \
  --template-arn arn:aws:acm-pca:::template/EndEntityClientAuthCertificate/V1 \
  --query CertificateArn --output text)

aws acm-pca get-certificate \
  --certificate-authority-arn $SUB_CA_ARN \
  --certificate-arn $BUILD_AGENT_CERT_ARN \
  --query Certificate --output text > build-agent-mldsa.pem

# In production, store the private key in a TPM or HSM rather than as a plaintext file.
aws_signing_helper credential-process \
  --certificate build-agent-mldsa.pem \
  --private-key build-agent-mldsa-key.pem \
  --trust-anchor-arn arn:aws:rolesanywhere:us-east-1:111122223333:trust-anchor/ta-id \
  --profile-arn arn:aws:rolesanywhere:us-east-1:111122223333:profile/profile-id \
  --role-arn arn:aws:iam::111122223333:role/PQCBuildAgentRole

The helper produces short-lived AWS Security Token Service (AWS STS) credentials scoped to the build role, replacing long-lived AWS access keys. In production, protect the ML-DSA private key with hardware-backed storage such as a Trusted Platform Module (TPM), an HSM, or an encrypted credential store with restricted file permissions. The plaintext file path shown here is for demonstration purposes. The private key authorizes access to your code-signing infrastructure and should be treated with the same protection level as any signing key. On Linux build agents, at minimum restrict the file to chmod 400 owned by the service account and consider using a PKCS#11 provider to avoid storing the raw key on disk entirely.

A signing architecture is only as strong as its verification. Producing signatures is half the story. The other half is giving the systems and people that deploy your artifacts, such as deployment pipelines, Kubernetes admission controllers, and engineers installing a package, a concrete way to verify those signatures and make trust decisions before an artifact is deployed or run.

Before any verifier can check a signature, it needs to trust the CA that issued the code-signing certificate. This trust is established through a trust store: a local collection of root CA certificates that a system treats as authoritative. Trust stores exist in operating systems (such as /etc/pki/ca-trust/ on Linux, Keychain on macOS), language run-times (Java cacerts), container base images, and custom application configurations.

For private PKI hierarchies like the one in this post, your root CA certificate isn’t in any default public trust store. You must explicitly add it to the trust stores of every system that will verify your signatures. Common approaches include:

• Baking the root CA certificate into your container base images during the build process
• Distributing it through configuration management (AWS Systems Manager Parameter Store, AWS Secrets Manager, or your existing configuration tooling)
• Publishing it to an internal S3 bucket with versioning and access logging
• Storing it as an OCI artifact in Amazon ECR alongside the images it protects

Treat trust store management with the same rigor as credential management. If an attacker can inject a rogue root certificate into your trust stores, they can make forged signatures appear valid. Restrict write access to trust stores and audit changes through AWS CloudTrail or your system-level audit logs.

Exporting your certificate chain requires exporting the root CA, and then any subordinate CAs that issue certificates that will be involved in verifying signatures:

# Export the root CA certificate
aws acm-pca get-certificate-authority-certificate \
  --certificate-authority-arn <root-ca-arn> \
  --query Certificate --output text > root-ca.pem

# Export the subordinate CA certificate. Select only the Certificate field: for a
# subordinate CA this call also returns CertificateChain, and --output text would
# print both on one tab-separated line, producing a file that OpenSSL can't parse.
aws acm-pca get-certificate-authority-certificate \
  --certificate-authority-arn <sub-ca-arn> \
  --query Certificate --output text > sub-ca.pem
  
# Bundle the full chain for verifiers
cat root-ca.pem sub-ca.pem > trust-chain.pem

Verifiers use this chain to confirm that the code-signing public key was issued by a CA they trust.

The CAs in this post are created without a revocation configuration, and the verification commands that follow don’t check revocation status, which keeps the walkthrough short. In production, configure a certificate revocation list (CRL) or an Online Certificate Status Protocol (OCSP) responder on the subordinate CA (see Plan your AWS Private CA certificate revocation method in the AWS Private CA User Guide; both work with ML-DSA CAs). If you use a CRL, distribute it alongside the trust chain and add -crl_check -CRLfile <crl-file> to the openssl verify command below, where <crl-file> is the CRL that AWS Private CA publishes to your S3 bucket, so that a revoked code-signing certificate fails verification.

Verify the code-signing certificate against the trust chain, confirm that it is a code-signing certificate issued to the signer you expect, extract its public key, and then verify the signature with OpenSSL 3.5. The second check matters: a chain check alone accepts every certificate that the CA hierarchy has issued, including the build agent client certificates from the previous section, so pin the expected subject in your verifier configuration:

# Step 1: Verify that the code-signing certificate chains to the trusted root CA and carries the
# Code Signing extended key usage. -purpose codesign (OpenSSL 3.2 and later) rejects a certificate
# that chains correctly but was issued for another purpose, such as a build agent's client
# authentication certificate from the same subordinate CA.
# trust-chain.pem contains the root CA and subordinate CA certificates distributed in the previous section.
openssl verify -CAfile trust-chain.pem -purpose codesign code-signing-cert.pem
# Confirm that the certificate was issued to the signer you expect. Replace <signer-cn> with the
# common name in your code-signing certificate's subject.
openssl x509 -in code-signing-cert.pem -noout -subject -nameopt RFC2253 | grep -q "CN=<signer-cn>" || { echo "Unexpected signer"; exit 1; }

# Step 2: Extract the public key from the verified certificate.
openssl x509 -in code-signing-cert.pem -pubkey -noout > signing-key.pem

# Step 3: Verify the artifact signature using the trusted public key.
openssl pkeyutl -verify \
  -pubin -inkey signing-key.pem \
  -in artifact.bin \
  -sigfile artifact.bin.sig \
  -rawin

A successful verification prints Signature Verified Successfully and returns an exit status of 0. A failed verification prints Signature Verification Failure and returns a nonzero exit status. In shell scripts, check the exit status of each command, or run the block with set -e, so that a failed certificate chain check stops the script before signature verification and a failed signature check blocks downstream actions.

For an SBOM, run the same three steps with sbom.statement.json as the -in file and sbom.statement.json.sig as the -sigfile, then add a fourth: confirm that the subject digest inside the verified Statement is the digest of the artifact you are about to deploy. Signature verification proves the Statement is authentic; the subject check proves it describes this artifact and not another one. The digest you compare against must come from the artifact itself, resolved from the registry for an image or computed from the file for a binary, never from the Statement. For an image, this is the same digest you verify the image signature against, so the two checks together establish that this SBOM describes this signed image.

# Step 4 (SBOM only): the signed Statement must name the image being deployed.
# Resolve the digest from Amazon ECR, not from the Statement.
IMAGE_DIGEST=$(aws ecr batch-get-image \
  --repository-name myapp \
  --image-ids imageTag=v1.2.0 \
  --query 'images[0].imageId.imageDigest' --output text)
SUBJECT_DIGEST=$(jq -r '.subject[0].digest.sha256' sbom.statement.json)
[ "sha256:$SUBJECT_DIGEST" = "$IMAGE_DIGEST" ] || { echo "SBOM does not describe this image"; exit 1; }

# Only now extract the SBOM for downstream tooling
jq '.predicate' sbom.statement.json > sbom.json

For a binary, compare the subject digest to the output of sha256sum artifact.bin instead. Reject the SBOM if either the signature or the subject check fails.

Pull the ML-DSA signature from the OCI referrer artifact in Amazon ECR, then verify it against the image manifest digest:

# Pull the signature referrer. ORAS 1.2 lists referrers under "manifests";
# ORAS 1.3 and later list them under "referrers". The jq filter accepts either.
oras discover $ECR_URI@$IMAGE_DIGEST \
  --artifact-type "application/vnd.example.mldsa-signature.v1" --format json | \
  jq -r '(.referrers // .manifests)[0].digest' | \
  xargs -I{} oras pull $ECR_URI@{} -o /tmp/sig/

# Re-derive the image digest and verify
echo -n "$IMAGE_DIGEST" > /tmp/digest.txt
openssl pkeyutl -verify \
  -pubin -inkey signing-key.pem \
  -in /tmp/digest.txt \
  -sigfile /tmp/sig/image.mldsa.sig \
  -rawin

# Exit code 0 = image is authentic; non-zero = reject deployment

The same oras discover command with --artifact-type "application/vnd.example.mldsa-sbom-attestation.v1" retrieves the SBOM attestation and its signature; verify them as described in the previous section, including the subject check. The jq filter shown takes the first referrer of the requested type. Don’t rely on the order in which a registry lists referrers, and expect more than one after an image has been re-signed: a production verifier should check every referrer of that type and accept the image if at least one signature verifies against a certificate that chains to your trust store. Taking only the first can reject a correctly signed image, but it can never accept an unsigned one.

To enforce these checks at deployment time, run them in a Kubernetes admission controller, a component that the API server calls before it accepts a pod and that can reject the request. You can write one as a validating admission webhook (see Dynamic Admission Control in the Kubernetes documentation), or use Open Policy Agent (OPA) Gatekeeper, an admission webhook that enforces policies evaluated by the OPA policy engine, and package the verification steps as a Gatekeeper external data provider that a constraint calls. For a worked example of gating Amazon EKS deployments on image signatures, see Announcing Container Image Signing with AWS Signer and Amazon EKS, which verifies AWS Signer signatures at admission with Kyverno and discusses the Gatekeeper and custom webhook alternatives. The ML-DSA signature referrer in this post is a custom artifact type that those tools don’t verify out of the box, so the verification steps in this section run in code you supply. In either design, the controller runs before any pod is scheduled, rejecting images that lack a valid ML-DSA signature referrer in Amazon ECR or whose SBOM attestation doesn’t name the image being deployed.

Signature verification stops the use of an untrusted artifact at deployment. Organization-level controls apply earlier and more broadly: preventive controls stop teams from creating new traditional signing keys, and detective controls record every signing operation so you can audit which principal signed each artifact and when.

Preventive guardrails. Use an AWS Organizations Service control policy (SCP) to block creation of traditional signing keys in security-critical accounts, forcing all new signing workloads to use ML-DSA:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "RequirePQCSigningKeys",
      "Effect": "Deny",
      "Action": "kms:CreateKey",
      "Resource": "*",
      "Condition": {
        "StringNotLike": {
          "kms:KeySpec": "ML_DSA_*"
        },
        "StringEquals": {
          "kms:KeyUsage": "SIGN_VERIFY"
        }
      }
    }
  ]
}

This SCP prevents teams from creating new RSA or ECDSA signing keys, enforcing quantum-resistant signatures as the only option for new workloads. Note that this SCP constrains the algorithm family, not the parameter set: it would still permit an ML-DSA-44 key, which this architecture doesn’t use. Part 2 of this series picks up at exactly this point. It shows how to express a complete algorithm policy (in its example, approve ML-DSA-65 and ML-DSA-87 and exclude ML-DSA-44) as layered controls using the kms:KeySpec condition key in SCPs, IAM permission boundaries, and AWS KMS key policies; how to restrict the use of keys that already exist; and how to govern surfaces such as AWS Private CA that have no algorithm condition key. This SCP and the parameter-set SCP in Part 2 work together: attach both, and every new signing key must use an approved parameter set.

Audit trail. AWS CloudTrail logs every kms:Sign and kms:Verify API call, providing an immutable record of when each artifact was signed and by which principal. Use an organization trail and query its logs with Amazon Athena to analyze signing activity across accounts and correlate it with your deployment events.

The following table maps regulatory milestones to specific actions you can take today using the architecture described in this post. This information is provided for general awareness only and does not constitute legal or compliance advice. Consult your legal and compliance teams to determine your organization’s specific obligations. For a broader overview of global PQC regulatory timelines, see Migrating to Post-Quantum Cryptography.

Note for NSS customers and other CNSA 2.0 adopters: CNSA 2.0 is the quantum-resistant algorithm suite that the NSA requires for NSS, the federal systems that carry classified information or support intelligence, cryptologic, military command and control, and weapons functions. When ML-DSA is used for any signature purpose, including software and firmware signing, CNSA 2.0 permits only the ML-DSA-87 parameter set. (For software and firmware signing it also approves the stateful hash-based schemes LMS and XMSS, which this post doesn’t cover.) The ML-DSA-65 parameter set used in this post’s code-signing examples is appropriate for commercial workloads but isn’t permitted on NSS. CNSA 2.0 is binding only for NSS, but it’s followed voluntarily well beyond that boundary: by suppliers to the US defense and intelligence market, in the United States and allied countries, whose products must meet NSS requirements, and by commercial organizations in and outside the United States that adopt it as a conservative baseline because it specifies the highest NIST security category and removes the need to revisit parameter choices later. If your systems fall under CNSA 2.0 scope, or you’ve chosen to align with it, substitute ML-DSA-87 for all signing keys and certificates. Part 2 of this series shows how to make that substitution enforceable: the same kms:KeySpec controls that exclude ML-DSA-44 in its example can be pointed at ML_DSA_87 as the only approved key spec.

For organizations serving both US government and EU commercial markets, the January 2027 and December 2027 deadlines converge into a single migration window. Starting now provides margin for testing, key rotation planning, and certificate chain validation.

You created a number of cryptographic resources in the prior steps and examples. AWS Private CA charges a monthly fee per CA and AWS KMS charges per key per month. To avoid ongoing charges, delete them if you aren’t actively using them. Start by listing what exists, so that you catch every resource you created, including duplicates from repeated runs. These commands list one Region; if you worked in more than one, repeat them with --region for each.

# List every private CA with its type, status, key algorithm, and subject.
# A CA you already deleted shows DELETED until its restoration window ends.
aws acm-pca list-certificate-authorities \
  --query 'CertificateAuthorities[].[Arn,Type,Status,CertificateAuthorityConfiguration.KeyAlgorithm,CertificateAuthorityConfiguration.Subject.CommonName]' \
  --output table

# List every ML-DSA key in AWS KMS with its state and creation date.
# A key already scheduled for deletion shows PendingDeletion.
for KEY_ID in $(aws kms list-keys --query 'Keys[].KeyId' --output text); do
  aws kms describe-key --key-id "$KEY_ID" \
    --query 'KeyMetadata.[KeyId,KeySpec,KeyState,CreationDate]' --output text
done | grep ML_DSA

# Show which alias points at which key. A key that no alias points at
# is usually a leftover from an earlier run.
aws kms list-aliases --query 'Aliases[].[AliasName,TargetKeyId]' --output text | grep -v '^alias/aws/'

AWS Private CA has no command that lists the certificates a CA has issued. If you need serial numbers for the revocation step that follows, generate an audit report with aws acm-pca create-certificate-authority-audit-report, which writes a list of every certificate the CA has issued or revoked to an S3 bucket that grants the service write access.

Delete each resource that you don’t need, including any extra copies that the listing revealed, then run the listing again to confirm that nothing is left:

# Revoke any issued end-entity certificates while the subordinate CA is still active
aws acm-pca revoke-certificate \
  --certificate-authority-arn <sub-ca-arn> \
  --certificate-serial <serial-number> \
  --revocation-reason CESSATION_OF_OPERATION

# Delete the IAM Roles Anywhere resources that reference the CA
aws rolesanywhere delete-profile --profile-id <profile-id>
aws rolesanywhere delete-trust-anchor --trust-anchor-id <trust-anchor-id>

# Delete the build agent role that the profile referenced, and the local copy of its private key
aws iam delete-role-policy --role-name PQCBuildAgentRole --policy-name pqc-code-signing
aws iam delete-role --role-name PQCBuildAgentRole
rm -f build-agent-mldsa-key.pem

# Delete the AWS KMS code-signing key (schedule 7-day waiting period).
# ScheduleKeyDeletion doesn't accept an alias, so resolve the key ID first.
KEY_ID=$(aws kms describe-key --key-id alias/pqc-code-signing \
  --query KeyMetadata.KeyId --output text)
aws kms schedule-key-deletion --key-id $KEY_ID --pending-window-in-days 7

# Remove the alias. It survives key deletion and would otherwise show up in the
# listing above on your next run.
aws kms delete-alias --alias-name alias/pqc-code-signing

# Disable and delete the subordinate CA
aws acm-pca update-certificate-authority \
  --certificate-authority-arn <sub-ca-arn> --status DISABLED
aws acm-pca delete-certificate-authority \
  --certificate-authority-arn <sub-ca-arn> --permanent-deletion-time-in-days 7

# Disable and delete the root CA
aws acm-pca update-certificate-authority \
  --certificate-authority-arn <root-ca-arn> --status DISABLED
aws acm-pca delete-certificate-authority \
  --certificate-authority-arn <root-ca-arn> --permanent-deletion-time-in-days 7

If you are adapting this for long-term use, plan for log retention. CloudTrail Event History keeps only the last 90 days of management events and is not a substitute for a trail. For the audit trail described earlier, create a trail that delivers to an S3 bucket with the lifecycle policy and access controls your retention requirements call for.

In this post, I showed you how to build a quantum-resistant software supply chain on AWS by combining ML-DSA signing in AWS KMS, ML-DSA certificate hierarchies in AWS Private CA, and ML-DSA workload authentication through IAM Roles Anywhere. The architecture covers the full pipeline; from authenticated build agents through signed binaries, container images, and SBOMs, to verification and policy enforcement at deployment.

Every ML-DSA capability used in this post is generally available. AWS Private CA and IAM Roles Anywhere support ML-DSA in all commercial AWS Regions, the AWS GovCloud (US) Regions, and the China Regions, and AWS KMS supports ML-DSA in commercial AWS Regions. You don’t need to wait for a standards body or third-party tool to finalize PQC support. The primitives are ready.

To get started, create your first ML-DSA key in AWS KMS and sign a test artifact. From there, extend to your PKI hierarchy, integrate IAM Roles Anywhere for your build agents, and add ML-DSA signatures to your container and SBOM workflows.

Building the pipeline is half the work. The other half is making sure the algorithm choices you made stay in force as accounts, teams, and standards change. That’s the subject of Part 2 of this series, Enforce your ML-DSA algorithm policy with SCPs and IAM, written for the security and governance teams who own that problem.

For more information, see:

• Quantum-resistant signing on AWS, Part 2: Enforce your ML-DSA algorithm policy with SCPs and IAM
• Post-quantum cryptography on AWS
• ML-DSA keys in AWS KMS
• Post-quantum ML-DSA code signing with AWS Private CA and AWS KMS
• IAM Roles Anywhere post-quantum digital certificates
• AWS post-quantum cryptography migration plan

If you have feedback about this post, submit comments in the Comments section below.

The principle of least privilege is straightforward to articulate but challenging to maintain at scale. When teams first deploy applications to AWS, they often grant broader permissions than strictly necessary; it’s faster to get things working, and the plan is always to tighten permissions later. But later rarely comes. Permissions accumulate, AWS Identity and Access Management (IAM) principals that once needed broad access for initial deployment retain those permissions long after they’re necessary, and some principals stop being used entirely. Even small teams face this challenge—permission reviews aren’t a one-time task but an ongoing operational burden that demands automation.

AWS IAM Access Analyzer addresses detection and recommendation. It identifies unused permissions across IAM roles and users: actions that haven’t been exercised, services that haven’t been accessed, and principals that aren’t being assumed at all. For each finding, it generates a recommended policy with the excess permissions removed. Security teams can see exactly what to fix, but manual remediation doesn’t persist. A security engineer can right-size a role today, but if that role is defined in an AWS CloudFormation template or AWS Cloud Development Kit (AWS CDK) stack, the next deployment restores the original permissions. The fix must live where the role is defined, and not every role starts in the same place. Some are managed through infrastructure-as-code (IaC), where remediation means updating source code and deploying through a pipeline. Others were created manually through the AWS Management Console and have no code representation. And some principals aren’t being used at all and need a controlled decommission path. Each scenario requires a different remediation strategy.

This post walks through an automated remediation workflow that bridges the gap between detection and action. Instead of findings accumulating in a dashboard waiting for someone to investigate, the automation classifies each role by how it was created and produces a ready-to-review remediation artifact: a pull request with production-ready CDK code and a plain-English explanation for IaC-managed roles, an issue with the recommended policy and step-by-step IaC migration guidance for manually created roles, or a soft-disable issue with a monitored decommission plan for unused principals. Each output flows through your existing code review and issue tracking processes—the same workflows your teams already follow. By the end of this post, you’ll have a pattern that converts IAM Access Analyzer findings into tested, deployable code changes rather than a growing backlog of security tickets.

Unused IAM permissions increase the attack surface. Removing unused permissions limits the actions available to any compromised credentials, reducing potential impact. Roles that aren’t being assumed represent unused resources; removing them simplifies your IAM inventory and reduces potential access paths that aren’t actively monitored.

The challenge isn’t knowing what to fix. As we said earlier, Access Analyzer provides both the findings and the recommended policies. The challenge is acting on that knowledge consistently across your environment. Each finding requires context:

• What the role does
• Who created the role
• Determining if the permission is unused or used infrequently
• If the role is managed in a CloudFormation stack, or was created through the console

Multiply this by hundreds of roles and security teams face a backlog that grows faster than they can address it.

Manual remediation compounds the problem. A security engineer can right-size a role directly in the console, but that fix is fragile. If the role is defined in an IaC template, the next deployment restores the original permissions. If it was created manually, there’s no record of what changed or why, and no easy way to revert if the change causes issues.

This is where IaC changes the equation. When roles are defined in code, remediation means updating that code. Changes flow through pull requests, are reviewed by the team that owns the role, and deploy consistently across environments. The fix becomes permanent, not a point-in-time correction that drifts back on the next deployment. And because every change is tracked in version control, teams can confidently remove permissions knowing they can revert if something breaks. That safety net matters; it’s often the difference between a team acting on a finding and leaving it in the backlog.

The solution automates remediation by connecting four capabilities: IAM Access Analyzer for detection and policy recommendations, CloudTrail for role attribution, Amazon Bedrock for CDK code generation and plain-English explanations, and your existing continuous integration and delivery (CI/CD) pipeline for remediation execution. The workflow operates on a core principle: every IAM role has an origin, and that origin determines the remediation path.

Figure 1 shows the solution architecture: Amazon EventBridge triggers an AWS Lambda orchestrator on a daily schedule. The Lambda orchestrator integrates with IAM Access Analyzer, CloudTrail, Amazon Bedrock, and Amazon CloudWatch. Each finding is routed to one of three remediation paths: a pull request for IaC-managed roles, an issue for manually created roles, and a soft-disable issue for unused roles.

Figure 1: The daily remediation workflow; from scheduled trigger to the three role-based remediation paths

On each scheduled run, the automation retrieves active findings from IAM Access Analyzer and queries CloudTrail to determine how each role was created. Roles created through CloudFormation or AWS CDK have a traceable origin: the service principal, stack name, and originating repository. Roles created manually through the console have a different origin: the IAM user who created them and the timestamp. This distinction drives the remediation strategy.

For IaC-managed roles, the automation retrieves the IAM Access Analyzer-recommended policy and uses Amazon Bedrock to wrap it in production-ready CDK code that includes the role definition and policy statements and imports what your CI/CD pipeline needs to deploy the update. It then creates a pull request in the originating repository. The pull request (PR) includes the updated CDK code, a policy diff showing exactly which permissions are being removed, and a plain-English explanation of the changes, for example, “This change removes write access to S3, keeping only read and list permissions.” Your existing code review process evaluates the change, and after being merged, the fix deploys consistently across environments.

For manually created roles, the automation creates an issue that includes the IAM Access Analyzer-recommended policy with unused permissions removed, a diff highlighting the changes, and an Amazon Bedrock-generated explanation of what the permission changes accomplish. The issue also provides guidance on importing the role into your IaC codebase. This gives teams an immediate remediation path while encouraging long-term governance through IaC adoption.

For roles that aren’t being assumed at all, the automation takes a more cautious approach. Instead of taking direct action, it creates an issue recommending a soft-disable workflow: attach a deny-all policy to the role, monitor for 30 days to confirm no workload depends on it, then delete. The issue provides the steps and context, the team executes the decommission through their preferred process, whether that’s a console change, an AWS Command Line Interface (AWS CLI) script, or a PR removing the role from the IaC. This controlled decommission path reduces the risk of removing a role that’s used infrequently or seasonally.

The solution supports both single-account and organization-wide deployment. In single-account mode, it uses an ACCOUNT_UNUSED_ACCESS analyzer to process findings for one account. In organization mode, it uses an ORGANIZATION_UNUSED_ACCESS analyzer deployed in a delegated administrator account, which generates findings across all member accounts from a single vantage point. The Lambda function automatically detects which analyzer type is available and extracts the account ID from each finding’s resource Amazon Resource Name (ARN), so role attribution and remediation routing work the same way regardless of scope.

This three-path strategy acknowledges operational reality. Not all roles start in IaC, not all unused roles are safe to delete immediately, and forcing immediate migration isn’t always practical. The solution provides a clear path forward for each scenario: remediate IaC roles through code, give teams actionable recommendations for manually created roles, and safely decommission what’s no longer needed. Over time, your infrastructure becomes increasingly code-driven, and remediation becomes a routine part of your CI/CD process rather than a manual security task.

Consider a company—call them AnyCompany—running 200 IAM roles across three AWS accounts. Some roles were created through AWS CDK stacks during initial deployment. Others were created manually through the console by engineers who needed quick access during incident response or prototyping. A handful haven’t been assumed in over 6 months. AnyCompany’s security team wants to act on their IAM Access Analyzer findings, but each role requires different handling. The solution’s architecture addresses this by routing each finding through a classification and remediation pipeline.

Figure 2 shows how each IAM Access Analyzer finding is processed:

1. The finding is first checked against exclusions and excluded findings are skipped.
2. Remaining findings are split by type: UnusedPermission findings retrieve a recommended policy from IAM Access Analyzer and then query CloudTrail for role origin, while UnusedIAMRole findings follow the unused role path.
3. By origin, IaC-managed roles generate AWS CDK code using Amazon Bedrock and create a pull request.
4. Manually created or unknown-origin roles create an issue with the recommended policy and IaC migration guidance.
5. Unused roles create a soft-disable issue to deny-all, monitor for 30 days, then delete.
6. All paths publish CloudWatch metrics.

Figure 2: Detailed component interactions—the orchestrator’s five steps, its four service integrations, and the three remediation paths

The rest of this section walks through each component using AnyCompany’s roles as examples.

Before processing any finding, the Lambda function loads an exclusion configuration and checks whether the role should be skipped. This prevents the automation from creating remediation items for roles that legitimately need broad permissions.

{
  "excluded_roles": [
    "arn:aws:iam::123456789012:role/BreakGlassRole",
    "arn:aws:iam::123456789012:role/ServiceLinkedRole"
  ],
  "excluded_permissions": [
    "iam:*",
    "sts:AssumeRole"
  ],
  "excluded_by_tag": {
    "NoRemediation": ["true"],
    "CriticalService": ["true"]
  },
  "min_unused_days": 30
}

AnyCompany excludes their break-glass role (used only during incidents), any service-linked roles, and roles tagged CriticalService. The min_unused_days threshold prevents false positives from seasonal workloads; a role that ran a quarterly batch job 25 days ago won’t generate a finding.

IAM Access Analyzer generates two types of findings relevant to this solution. UnusedPermission findings identify roles with permissions that haven’t been exercised within the analysis period. UnusedIAMRole findings identify roles that haven’t been assumed at all. The Lambda function queries both finding types separately because they follow different remediation paths.

The Lambda function auto-detects the analyzer type at startup. When ANALYZER_SCOPE is set to organization, it checks for an ORGANIZATION_UNUSED_ACCESS analyzer first and falls back to ACCOUNT_UNUSED_ACCESS if none exists. If multiple analyzers of the same type exist in the account, the Lambda function selects the first active analyzer returned by the API. To target a specific analyzer, set the ANALYZER_ARN environment variable explicitly. With an organization-level analyzer, findings include roles from all member accounts. The Lambda function extracts the account ID from each finding’s resource ARN (for example, account 111122223333 from arn:aws:iam::111122223333:role/MyRole) and carries that context through the entire pipeline: attribution, remediation, and issue or PR creation all include the originating account.

For UnusedPermission findings, the Lambda function calls GenerateFindingRecommendation to initiate policy generation, then retrieves the IAM Access Analyzer-recommended policy through the GetFindingRecommendation API. This is a key integration point: IAM Access Analyzer provides the right-sized policy with unused permissions removed, so the automation doesn’t need to generate policies itself.

Here’s what a typical finding looks like for one of AnyCompany’s application roles:

{
  "id": "a1b2c3d4-5678-90ab-cdef-example11111",
  "resource": "arn:aws:iam::123456789012:role/AnyCompanyOrderProcessorRole",
  "findingType": "UnusedPermission",
  "analyzedAt": "2026-03-01T00:00:00Z",
  "unusedPermissions": [
    { "action": "s3:PutObject", "lastAccessed": null },
    { "action": "s3:DeleteObject", "lastAccessed": null },
    { "action": "s3:PutBucketPolicy", "lastAccessed": null },
    { "action": "dynamodb:DeleteItem", "lastAccessed": null }
  ],
  "activePermissions": [
    { "action": "s3:GetObject", "lastAccessed": "2026-02-28T14:30:00Z" },
    { "action": "s3:ListBucket", "lastAccessed": "2026-02-28T14:30:00Z" },
    { "action": "dynamodb:Query", "lastAccessed": "2026-02-28T12:00:00Z" }
  ]
}

The OrderProcessorRole has write and delete permissions for Amazon Simple Storage Service (Amazon S3) and Amazon DynamoDB, but only uses read operations. The IAM Access Analyzer recommendation removes the four unused actions while preserving the three active ones.

For UnusedIAMRole findings, no recommendation is needed: the role isn’t being assumed at all, so the remediation is to disable or delete it. The Lambda function caps the number of unused role issues per run (configurable using MAX_UNUSED_ROLE_ISSUES, default 10) to avoid overwhelming teams with a flood of issues on the first execution.

For each finding, the Lambda function queries CloudTrail to determine how the role was created. The CreateRole event contains the information needed to classify the role’s origin.

An IaC-created role looks like this in CloudTrail:

{
  "eventName": "CreateRole",
  "userIdentity": {
    "type": "AWSService",
    "invokedBy": "cloudformation.amazonaws.com"
  },
  "requestParameters": {
    "roleName": "AnyCompanyOrderProcessorRole"
  },
  "userAgent": "cloudformation.amazonaws.com"
}

The cloudformation.amazonaws.com service principal and user agent tell the automation this role was created through a CloudFormation or AWS CDK deployment. The Lambda function then looks up the role’s tags to find the originating repository (stored in a Repository tag set during deployment).

A manually-created role looks different:

{
  "eventName": "CreateRole",
  "userIdentity": {
    "type": "IAMUser",
    "userName": "jstiles"
  },
  "requestParameters": {
    "roleName": "AnyCompanyIncidentResponseRole"
  },
  "userAgent": "console.amazonaws.com"
}

Here, the IAMUser type and console.amazonaws.com user agent indicate someone created this role through the console. Roles created through the AWS CLI show a similar pattern: the IAMUser type with a user agent like aws-cli/2.x.x. The automation classifies both console and AWS CLI-created roles as manually created, because neither has an IaC origin that can be updated programmatically. The automation captures the username and timestamp for the remediation issue.

When the Lambda function processes findings from an organization-level analyzer, the role might live in a different account than the one running the function. The automation handles this by assuming a cross-account role (configurable using CROSS_ACCOUNT_ROLE_NAME, defaulting to OrganizationAccountAccessRole) in the member account, then querying that account’s CloudTrail and IAM APIs for the CreateRole event. If the cross-account assume fails—because the role doesn’t exist in that account or permissions aren’t configured—the automation falls back gracefully, classifying the role as unknown origin and creating an issue with the account ID and available context. This approach helps the automation produce an actionable output for findings even when attribution is incomplete.

For IaC-managed roles with UnusedPermission findings, the Lambda function retrieves the IAM Access Analyzer-recommended policy and sends it to Amazon Bedrock to generate production-ready AWS CDK code. This is an important distinction: IAM Access Analyzer decides what the policy should be, and Amazon Bedrock wraps that policy in the AWS CDK constructs, imports, and resource definitions that the CI/CD pipeline needs to deploy the update.

The prompt instructs Amazon Bedrock to convert the recommended policy to AWS CDK code exactly as provided, with no modifications:

Generate Python CDK code that creates/updates the role with the
RECOMMENDED policy exactly as provided. Include proper imports
(aws_cdk, aws_iam), use CDK best practices (PolicyStatement,
proper resource ARNs), and add tags: ManagedBy=CDK,
RemediatedBy=AccessAnalyzer.

IAM Access Analyzer generates recommendations for both inline policies and customer managed policies. When a managed policy has partially unused permissions, the recommendation contains the full right-sized policy. The automation wraps this in AWS CDK code as an iam.ManagedPolicy construct. Note that if a managed policy is shared across multiple roles, the recommendation applies to the specific role’s usage pattern. In this case, the automation generates an issue for manual review rather than a PR, because modifying a shared policy could affect other roles.

The generated code goes through a validation step before inclusion in any PR. The Lambda function compiles the Python code to check for syntax errors and verifies that required AWS CDK patterns (iam, PolicyStatement) are present. If validation fails, the finding is logged as an error rather than creating a broken PR.

The solution doesn’t currently invoke the IAM Access Analyzer ValidatePolicy API to check the generated policy for errors or overly permissive statements. However, this is a natural extension point. Teams can add a validation step that calls ValidatePolicy on the Amazon Bedrock-generated policy before including it in a PR, detecting issues like missing resource constraints or invalid action names.

Amazon Bedrock also generates a plain-English explanation of the policy changes. For AnyCompany’s OrderProcessorRole, the explanation might read:

“The role currently has full S3 write access and DynamoDB delete permissions, but only uses read operations. Removing s3:PutObject, s3:DeleteObject, s3:PutBucketPolicy, and dynamodb:DeleteItem reduces the scope of impact if credentials are compromised, while preserving the s3:GetObject, s3:ListBucket, and dynamodb:Query permissions the application needs.”

The solution uses the Anthropic Claude Sonnet model on Amazon Bedrock for CDK code generation (where accuracy matters) and Claude Haiku on Amazon Bedrock for explanations (where speed and cost efficiency matter more).

The Lambda function evaluates each finding’s origin and routes it to one of three remediation paths.

Path 1: IaC-managed roles (pull request) – For AnyCompany’s OrderProcessorRole, the automation creates a PR in the originating repository. The PR includes:

• The Amazon Bedrock-generated AWS CDK code implementing the IAM Access Analyzer-recommended policy
• A policy diff showing exactly which permissions are being removed
• The plain-English explanation of what the changes accomplish
• Labels (security, iam-remediation, automated) for filtering and tracking

The team that owns the role reviews the PR through their normal code review process. Once merged, the fix deploys consistently across environments through the existing CI/CD pipeline.

Path 2: Manually-created roles (issue) – For AnyCompany’s IncidentResponseRole, the automation creates an issue that includes the Access Analyzer-recommended policy with unused permissions removed, a diff highlighting the changes, an Amazon Bedrock-generated explanation, and step-by-step guidance on importing the role into IaC. This gives the team an immediate remediation path (apply the recommended policy) while encouraging long-term governance through IaC adoption.

Path 3: Unused roles (soft-disable issue) – For roles that haven’t been assumed at all, the automation creates an issue recommending a three-stage decommission workflow: attach a deny-all policy to the role, monitor for 30 days to confirm no workload depends on it, then delete. This controlled approach reduces the risk of removing a role that’s used infrequently or seasonally – if something breaks during the monitoring period, removing the deny-all policy restores access immediately.

Dry-run mode

Before creating real PRs and issues, you can run the automation in dry-run mode by setting “dry_run": true in the CI/CD configuration or setting the CI_CD_PLATFORM environment variable to dryrun. In this mode, the Lambda function processes findings, classifies roles, and generates remediation data, but logs what it would create instead of making actual API calls to your repository platform. You can use the log to validate the automation’s behavior, review the classification accuracy, and tune exclusions before going live.

Operational metrics

The Lambda function publishes CloudWatch metrics after each run:

These metrics feed into dashboards and alarms. AnyCompany sets an alarm on errors > 5 to catch API throttling or configuration issues, and tracks prs_created + issues_created over time to measure remediation velocity.

The solution ships as two AWS CDK stacks and deploys in minutes. The accompanying GitHub repository contains the complete source code, AWS CDK stacks, configuration templates, and step-by-step deployment instructions.

At a high level, deployment involves:

1. Prerequisites: An AWS account with an ACCOUNT_UNUSED_ACCESS or ORGANIZATION_UNUSED_ACCESS analyzer enabled, Python 3.11 or later, AWS CDK v2, a CI/CD platform API token stored in AWS Secrets Manager, and Amazon Bedrock model access for the Anthropic Claude models you plan to use. The model IDs are configurable environment variables (BEDROCK_CODEGEN_MODEL and BEDROCK_EXPLANATION_MODEL); Amazon Bedrock retires older foundation models over time, so if the shipped defaults stop working, set these variables to current models you have enabled and redeploy. The repository README documents this.
2. Configuration: Two files in the config/ directory control behavior. exclusions.json defines which roles and permissions to skip (break-glass roles, service-linked roles, tagged exceptions), and ci_cd_config.json configures your repository platform integration (GitLab or GitHub), labels, and throttling limits.
3. Deploy: Run cdk deploy --all to create the Lambda function, EventBridge schedule, IAM roles, and CloudWatch alarms.
4. Validate in dry-run mode: Start with “dry_run": true to see how the automation classifies your roles without creating real PRs or issues. Review the CloudWatch logs to confirm attribution accuracy and tune exclusions.
5. Go live: Set “dry_run": false and redeploy. The Lambda function runs on schedule (daily by default) and begins creating PRs and issues.

The repository README covers each step in detail, including organization-wide deployment, cross-account configuration, and platform-specific setup for GitLab and GitHub.

Deploying the automation is only the starting point. Running it in production means making decisions about how roles are retired, how the volume of findings is managed at scale, which roles warrant human review before any change is proposed, and how you measure the automation’s impact over time. The following practices keep remediation sustainable as your IAM footprint grows, so the automation reduces operational burden rather than adding to it.

Unused roles follow a three-stage decommission workflow. When the automation identifies a role that hasn’t been assumed within the analysis period, it creates an issue with the recommended decommission steps; the automation doesn’t modify the role directly. The team then follows the soft-disable approach:

1. Attach a deny-all inline policy to the role. This blocks all actions without deleting the role or its existing policies.
2. Monitor for 30 days. If a workload depends on the role (seasonal jobs, infrequent batch processes), the deny-all policy surfaces the dependency quickly. Removing the deny-all policy restores full access immediately; no need to recreate the role or reattach policies.
3. Delete the role after the monitoring period confirms no impact.

This approach is deliberately conservative. Deleting a role is irreversible; you lose the trust policy, attached policies, and any resource-based policies that reference it. The soft-disable step gives teams a safety net while still making progress on reducing their unused role inventory.

On AnyCompany’s first run, the automation found 47 unused permission findings and 4 unused roles. That’s manageable. But organizations with hundreds of accounts and thousands of roles might see significantly more findings on initial deployment.

This is especially true with an organization-level analyzer. A single-account deployment might surface dozens of findings; an organization-level analyzer across multiple accounts could surface hundreds or thousands on the first run. The throttling controls become critical at this scale.

Two throttling controls prevent the automation from overwhelming teams:

• max_findings_per_run (default 50): Caps the total UnusedPermission findings processed per Lambda function execution. Remaining findings are picked up on the next scheduled run.
• MAX_UNUSED_ROLE_ISSUES (default 10): Caps unused role issues per run. This is especially important during initial deployment when you might have a large backlog of roles that haven’t been assumed in months.

Start with conservative limits and increase them as your team builds confidence in the review process. A team that can review 10 PRs per week shouldn’t receive 50 on Monday morning.

Not every role should receive automated PRs. Roles with administrative permissions or access to sensitive data might warrant manual review before any remediation is created. The exclusion configuration supports this through the approval_required_for_tags field:

{
  "approval_required_for_tags": {
    "Sensitive": ["true"],
    "Admin": ["true"]
  }
}

Roles matching these tags generate issues for manual review instead of automated PRs, regardless of whether they’re IaC-managed. This gives security teams a checkpoint for high-risk roles while still automating remediation for standard application roles.

The metrics published after each Lambda function run (covered in the Technical details section) feed into CloudWatch dashboards and alarms. A few patterns worth setting up:

• Alert on errors > 5 per run to catch API throttling, expired CI/CD tokens, or Amazon Bedrock availability issues.
• Track prs_created + issues_created over time. A healthy trend shows this number decreasing as your environment converges toward least privilege.
• Monitor unused_roles_found as a leading indicator. A sudden increase might signal a team spinning up roles for a project and not cleaning up afterward.
• Compare iac_roles_found to manual_roles_found over time. As teams adopt IaC, the ratio should shift toward IaC-managed roles, which means more automated remediation and less manual work.

The solution uses Lambda (minimal cost at daily execution), CloudTrail (typically already enabled), IAM Access Analyzer (charges per IAM role or user analyzed per month for the unused access analyzer), and Amazon Bedrock (pay-per-token for AWS CDK code generation and explanations). For most organizations the ongoing cost is low, and Amazon Bedrock token usage is the largest variable, scaling with the number of findings processed per day and the complexity of each policy. Review the pricing pages for each service for current rates.

For organization-level deployments, the IAM Access Analyzer cost scales with the number of IAM roles analyzed across all member accounts. The ORGANIZATION_UNUSED_ACCESS analyzer charges per role per month across the organization, so an organization with 500 roles across 20 accounts will see higher analyzer costs than a single account with 50 roles. Review the IAM Access Analyzer pricing page for current rates.

To remove the solution, run cdk destroy --all from the infrastructure/ directory. This removes the Lambda function, EventBridge rule, CloudWatch alarms, and IAM roles created by the stacks.

If you stored a CI/CD platform API token in Secrets Manager as part of deployment, delete it with aws secretsmanager delete-secret --secret-id <your-secret-name> --recovery-window-in-days 7. The 7-day recovery window lets you restore the secret if the deletion was accidental. After 7 days, the secret is permanently deleted and can’t be recovered. To delete immediately without a recovery window, add --force-delete-without-recovery.

Lambda automatically creates a CloudWatch Logs log group at /aws/lambda/<function-name> that persists after cdk destroy --all and continues to incur log storage charges. To remove it, run aws logs delete-log-group --log-group-name /aws/lambda/<function-name>. WARNING: This permanently deletes all execution logs.

The IAM Access Analyzer isn’t created by the AWS CDK stacks. WARNING: Deleting the analyzer permanently removes all findings, analysis history, and unused permission data. Export any findings you need to retain before deletion. After exporting, run aws accessanalyzer delete-analyzer --analyzer-name <your-analyzer-name> to delete it. The ACCOUNT_UNUSED_ACCESS and ORGANIZATION_UNUSED_ACCESS analyzer types incur charges based on the number of IAM roles and users analyzed per month.

If you deployed in organization mode and created cross-account roles (default name: OrganizationAccountAccessRole) in member accounts solely for this solution, remove them from those accounts.

Any PRs or issues already created in your CI/CD platform remain after stack deletion; they’re artifacts in your repository, not AWS resources. See the repository README for detailed cleanup instructions.,

Automating IAM permission remediation turns least privilege from a periodic compliance exercise into an operational practice. By connecting IAM Access Analyzer findings and recommendations to your CI/CD pipeline, remediation shifts from manual security tasks to code review processes that your teams already follow.

The three-path strategy acknowledges how infrastructure evolves. IaC-managed roles receive pull requests with production-ready AWS CDK code and plain-English explanations. Manually created roles receive actionable issues with recommended policies and IaC migration guidance. Unused roles are put on a controlled decommission path that protects against accidental disruption. Over time, the manual role count decreases as teams adopt IaC, and remediation becomes a routine part of your deployment pipeline.

Start with a pilot. Choose 10–20 non-production roles, deploy in dry-run mode, and review the classification results. Tune your exclusions, confirm the CloudTrail attribution is accurate for your environment, and then enable live remediation. Expand to production roles after your team is comfortable with the review cadence.

When you’re ready to scale beyond a single account, switch to an organization-level analyzer and the same Lambda function will process findings across all member accounts with no architectural changes required, only a configuration toggle.

The complete source code, AWS CDK stacks, and configuration templates are available in the accompanying GitHub repository.

If you have feedback about this post, submit comments in the Comments section below.

Organizations in regulated industries such as financial services, government, defense, and healthcare restrict their sensitive workloads to isolated network environments with no access to the public internet. Until now, customers could restrict AWS Management Console access to authorized AWS accounts and corporate networks, but the console itself required internet connectivity. This was creating tension between operational convenience and network security controls.

We’re happy to announce that AWS Management Console Private Access is now generally available with support for virtual private clouds (VPCs) without internet connectivity. Organizations in regulated industries that restrict workloads to isolated network environments can now route all traffic for supported service consoles—including authentication flows, static assets (JavaScript, CSS, images), console-only APIs, and AWS service API calls—through AWS PrivateLink VPC endpoints, eliminating the need for an internet gateway, NAT gateway, or any route to the public internet. This capability is available in all AWS commercial Regions for a select set of supported service consoles.

In 2023, we launched AWS Management Console Private Access, which you can use to connect to the console by routing console, sign-in, and service API calls through VPC endpoints. However, accessing the console required internet connectivity for static assets and console-only APIs. This meant security teams faced a choice: allow internet connectivity to use the console or deny console access to operators working in network-isolated environments.

With this launch, AWS Management Console Private Access addresses two common scenarios:

• Console traffic over internet restricted networks: Traffic for supported service consoles now flows entirely through your VPC endpoints—no proxy allowlists to maintain, no TLS-intercepting proxies to operate, and no CLI-only workflows to accept as a compromise. The same path works seamlessly from Amazon WorkSpaces, Amazon Elastic Compute Cloud (Amazon EC2) instances, and on-premises networks connected through AWS Direct Connect or AWS Site-to-Site VPN. Combined with sign-in resource control policies (RCPs) and sign-in resource policies, you can ensure that console authentication only succeeds from expected networks—even if valid credentials are presented elsewhere, the session is denied. Teams that previously relied on restricted egress rules or manual domain allowlists now get full console access with the same network controls they already trust.
• Data-exfiltration prevention: Private Access enables you to restrict which AWS accounts and organizational identities can use the AWS Management Console from within your VPC. This prevents access from personal accounts and from accounts outside your organization. Attach a VPC endpoint policy with an aws:ResourceOrgID condition, and console actions are automatically scoped to resources inside your organization. Sign-in RCPs add a second layer by ensuring authentication only succeeds from networks within your perimeter. Together, these controls prevent supported service consoles from being used to access resources in accounts outside your organization—such as personal accounts—without requiring complex network-layer workarounds.

In this post, you will learn how AWS Management Console Private Access works in environments without internet connectivity, and how to layer access controls using VPC endpoint policies and sign-in resource control policies (RCPs) to strengthen your data perimeter.

Solution overview

AWS Management Console Private Access and sign-in resource control policies are a natural extension of the service control policies (SCPs), resource control policies, and VPC endpoint policies you already use for API traffic; now applied to the console session itself. The same data perimeter controls for identity, resource, and network that protect your programmatic access now protect interactive browser sessions too.

With this launch, Console Private Access routes browser traffic for supported service consoles through VPC endpoints, including:

• Authentication flows – Sign-in, credential exchange, and session token requests
• Static assets – JavaScript, CSS, and images that render the console UI
• Service console API calls – The backend requests made when users interact with service consoles

How traffic flows from a workload in a private VPC through the three Private Access endpoints, with no path to the public internet (shown in Figure 1):

1. The operator’s browser requests <region>.console.aws.amazon.com.
2. The corporate DNS forwarder forwards the query to an Amazon Route 53 Resolver inbound endpoint configured within the VPC, which forwards the traffic to the console VPC endpoint.
3. Browser traffic flows from on-premises through Direct Connect (or AWS Site-to-Site VPN) to the VPC, and the VPC endpoint routes traffic to the console service over the AWS private network.
4. The console service redirects to the SignIn endpoint <region>.signin.aws.amazon.com to establish a browser session.
5. The DNS now resolves to the SignIn VPC endpoint’s private IP addresses, and browser traffic flows to the SignIn service over the AWS private network.
6. After entering credentials, the SignIn service evaluates VPC endpoint policies, in addition to resource-based policies (RBPs) and RCPs, then redirects back to the console.
7. The console evaluates VPC endpoint policies, loads static content from the console API VPC endpoint, and enforces identity and resource restrictions when making calls to AWS service APIs.
8. Users can now access the AWS Management Console over Private Access.

Figure 1: Network isolation architecture

Deploy a pilot of AWS Management Console Private Access

This high-level walkthrough sets up AWS Management Console Private Access for a single AWS Region within one organizational unit (OU). We recommend rolling out incrementally; validate each step before you expand to additional Regions and OUs.

If you want to validate the mechanics of a Private Access deployment before you build out the full solution, the Getting started with a test environment guide walks you through a minimal configuration: a single VPC with the three Private Access endpoints and a permissive policy. This gives you a working setup to experiment with, independent of the deployment described in the rest of this post. To understand how sign-in policies can verify a user’s network location when they access the console, see Controlling console access with resource-based policies and resource control policies.

Prerequisites

You must have the following prerequisites:

• An AWS account that’s a member of an organization within AWS Organizations. The example RCP in Step 4 requires the management account access.
• A VPC in your chosen AWS Region with optional connectivity from your corporate network. This can be an AWS Direct Connect connection, an AWS Site-to-Site VPN, or workloads running directly in the VPC such as Amazon WorkSpaces or Amazon EC2 browsing instances.
• AWS CloudTrail enabled in the same Region to view ConsoleLogin events captured.
• Familiarity with AWS PrivateLink interface endpoints and AWS Identity and Access Management (IAM) policy evaluation.

Step 1: Baseline current console access

Before changing anything, use CloudTrail to map how your users access the console today. Search for eventName = ConsoleLogin over a representative window (we recommend 30 days) and review the sourceIPAddress, vpcEndpointId, and awsRegion fields. Identify which identity types are in use: root user, IAM user, SAML federation, and AWS IAM Identity Center. Decide which OU or account you will pilot with.

Note: A misconfigured sign-in policy can lock users out of the console. Avoid piloting in a production or shared account. Instead, use a dedicated test account and configure a break-glass principal (covered in Step 5) before enabling access enforcement.

Step 2: Create the Private Access VPC endpoints

In your chosen Region, create or identify a VPC to host the endpoints, then create three interface VPC endpoints in that VPC:

• com.amazonaws.<region>.console for the console.
• com.amazonaws.<region>.signin for AWS Sign-In.
• com.amazonaws.<region>.console-static for console-only APIs. This endpoint is required only if your VPC has no internet path.

Step 3: Configure private DNS for AWS Management Console Private Access

To use AWS Management Console Private Access, you must configure private DNS so that the console domains—.console.aws.amazon.com, .signin.aws.amazon.com, and the associated static-content domains—resolve to your interface endpoints’ network interfaces within your VPC.

• For workloads inside your VPC: If the workloads in your VPC use the default Amazon Route 53 Resolver, no additional DNS configuration is required. When you create each interface endpoint, enable the private DNS name option (set PrivateDnsEnabled = true). The public console domains will then resolve automatically to the endpoint network interfaces inside your VPC. If you use a custom DNS resolver or a private hosted zone, you must configure it explicitly to map the console domains to the endpoint addresses. See Working with private hosted zones for more information. For the complete list of domains and detailed DNS configuration steps, see the AWS Management Console Private Access required endpoints documentation.
• For workloads outside your VPC: For workloads that reach the endpoints from outside the VPC—such as corporate offices connecting over AWS Direct Connect or AWS Site-to-Site VPN—ensure that your corporate DNS resolver returns the endpoint addresses for these domains. See Simplify DNS management in a multi-account environment with Route 53 Resolver for more information.

Step 4: Verify private connectivity

Sign in to the console from a workload inside your VPC. The console should load normally. To confirm that traffic is routing through your VPC endpoints, look for the lock icon in the console navigation bar, shown in Figure 2.

Figure 2: Console Private Access

You can also verify in CloudTrail that recent ConsoleLogin events show the vpcEndpointId field populated with one of your endpoint IDs. Here’s an example CloudTrail ConsoleLogin event snippet showing the vpcEndpointId field:

{
  "eventVersion": "1.08",
  "userIdentity": {
    "type": "AssumedRole",
    "principalId": "AROA3XFRBF23EXAMPLE:john.doe",
    "arn": "arn:aws:sts::123456789012:assumed-role/Admin/john.doe",
    "accountId": "123456789012"
  },
  "eventTime": "2026-07-08T19:15:32Z",
  "eventSource": "signin.amazonaws.com",
  "eventName": "ConsoleLogin",
  "awsRegion": "us-east-1",
  "sourceIPAddress": "10.0.1.47",
  "userAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7)...",
  "requestParameters": null,
  "responseElements": {
    "ConsoleLogin": "Success"
  },
  "additionalEventData": {
    "LoginTo": "https://console.aws.amazon.com/console/home",
    "MobileVersion": "No",
    "MFAUsed": "Yes",
    "vpcEndpointId": "vpce-0abc123def456789a"
  },
  "eventID": "a1b2c3d4-5678-90ab-cdef-EXAMPLE11111",
  "eventType": "AwsConsoleSignIn",
  "recipientAccountId": "123456789012"
}

If the AWS Management Console doesn’t load, work through the following checks.

Private DNS is enabled on each interface endpoint (or your custom resolver returns the endpoint addresses)

When Private DNS is enabled, AWS automatically creates the DNS entries that resolve the service domains (such as console.aws.amazon.com) to the private IP addresses of your VPC endpoints. Without it, your browser still routes to the public AWS endpoints, bypassing your private access setup entirely.

1. Confirm that each endpoint shows PrivateDnsEnabled:

   aws ec2 describe-vpc-endpoints \
   --filters "Name=vpc-endpoint-type,Values=Interface" \
   --query "VpcEndpoints[].{Id:VpcEndpointId,Service:ServiceName,PrivateDns:PrivateDnsEnabled}" \
   --output table
   

2. Then, from within your VPC, verify that the domains resolve to private addresses:

   nslookup console.aws.amazon.com
   nslookup signin.aws.amazon.com
   
   # Should return a private IP (e.g., 10.x.x.x), not a public one
   

Each query should return a private IP address from your VPC CIDR range. If you use a custom DNS resolver instead of the Amazon-provided DNS, ensure your forwarding rules direct the AWS domain queries to the Route 53 Resolver inbound endpoints in your VPC.

The endpoint security groups allow HTTPS (TCP 443) from your workload subnets

Each VPC endpoint creates elastic network interfaces (ENIs) in your subnets, and these ENIs are governed by security groups. If those security groups don’t permit inbound HTTPS traffic from your workloads, the connection fails silently.

1. Identify the security groups attached to your endpoints:

   aws ec2 describe-vpc-endpoints --vpc-endpoint-ids vpce-0abc123def456789a \
     --query "VpcEndpoints[].Groups[].GroupId" --output text
   

2. Then verify that each security group allows inbound TCP 443 from your workload subnets:

   aws ec2 describe-security-groups --group-ids sg-xxxxxxxx \
     --query "SecurityGroups[].IpPermissions[?ToPort==\`443\`]" \
     --output json
   

For traffic from outside the VPC (Direct Connect or Site-to-Site VPN), corporate DNS returns the endpoint IPs and the route propagates correctly

If you access the console from an on-premises workstation connected over AWS Direct Connect or AWS Site-to-Site VPN, two additional conditions must be met.

1. Your corporate DNS must resolve the AWS domains to the VPC endpoint private IPs. From your on-premises machine, run:

   nslookup console.aws.amazon.com

   If this returns public AWS IPs, your corporate DNS isn’t forwarding queries through Route 53 Resolver. Configure conditional forwarding for the aws.amazon.com and amazonaws.com domains to your Resolver inbound endpoint IPs.

2. Second, network routes must propagate correctly. Ensure the route table associated with your endpoint subnets has propagated routes from your virtual private gateway (VGW) or transit gateway, so return traffic can reach your on-premises network. Verify this with:

   aws ec2 describe-route-tables \
     --filters "Name=association.subnet-id,Values=subnet-xxxxx" \
     --query "RouteTables[].PropagatingVgws"
   

A quick end-to-end validation: Run traceroute console.aws.amazon.com from your workstation and confirm the path uses private hops only—no traffic should traverse the public internet.

If the console loads but the lock icon is missing

If the console loads but the connection isn’t private (for example, the lock icon is missing), the browser is reaching the console over the public internet instead of through your VPC endpoints.

• Run nslookup console.aws.amazon.com from a workload inside the VPC. The result should be a private IP from your VPC CIDR range. A public IP means DNS is bypassing the endpoint, which usually happens because Private DNS has not been enabled on the interface endpoint (set PrivateDnsEnabled = true).
• For workloads outside the VPC, make sure your corporate DNS forwards the console domains into the VPC, for example, through an Amazon Route 53 Resolver inbound endpoint.

Step 5: Apply VPC endpoint policies

Attach an endpoint policy to the console and AWS Sign-In endpoints that limits access to identities in your organization. The static-content endpoint doesn’t support endpoint policies.

Begin with a permissive Allow * policy and confirm that traffic routes through the endpoints (you should see the vpcEndpointId field populated in CloudTrail console events). After confirming the routing, add restrictions to your VPC endpoint policy and observe the traffic.

A starter policy uses two condition keys: aws:PrincipalOrgID to restrict identities to your organization and aws:ResourceOrgID to restrict the resources the console can reach to your organization’s resources. The full reference, including additional condition keys and resource-restriction patterns, is in the AWS Management Console Private Access user guide.

For policies beyond the pilot, see Data perimeters on AWS. The data perimeter policy examples GitHub repository covers service-specific considerations for implementing data perimeters in your environment.

Step 6: Apply a Sign-In policy

Sign-In policies deny console authentication requests that don’t match your network or principal conditions. The policy is composed of a pre-authentication statement covering signin:Authenticate and a post-authentication statement covering signin:AuthorizeOAuth2Access and signin:CreateOAuth2Token. Include both statements.

For your pilot, deploy the policy as an RCP from your AWS Organizations management account. When enabled, the RCP applies to all accounts in your organization, so we recommend piloting in a dedicated test organization before rolling it out broadly. Activate enforcement by calling the signin:PutConsoleAuthorizationConfiguration API for the organization in the us-east-1 Region (AWS Sign-In replicates policies globally from there). Resource permission statements have no effect until console authorization is enabled.

Important: Configure at least one excluded principal as a break-glass path before you enable the RCP. The recommended principal is a dedicated IAM role.

1. Write the permission statements that define the network conditions:
   Example – Restrict access to corporate VPC:

   aws signin put-resource-permission-statement \
     --source-vpc vpc-0abc123def456789 \
     --requested-region us-west-2 \
     --excluded-principal "arn:aws:iam::123456789012:user/EmergencyAdmin" \
     --region us-east-1
   

   Example – Restrict access to specific IP range:

   aws signin put-resource-permission-statement \
     --source-ip "IP_ADDRESS" \
     --excluded-principal "arn:aws:iam::123456789012:role/BreakGlassRole" \
     --region us-east-1
   

2. Enable console authorization for the organization to start enforcing the policy.

   aws signin put-console-authorization-configuration \
     --target-id <your-target-id> \
     --region us-east-1
   

3. Review the consolidated policy that’s now in effect: 

   aws signin get-resource-policy --region us-east-1
   

For policy examples, the AWS Command Line Interface (AWS CLI) reference, and the lockout-recovery procedure, see the sign-in RBP blog post and the Controlling console access with resource-based policies documentation. The same documentation also covers the per-account alternative, which uses an RBP attached to a single account instead of an organization-wide RCP.

Step 7: Add a service VPC endpoint

So far, the console shell loads, the lock icon appears, and your Sign-In policy lets approved identities through. If you sign in to a service console such as the AWS Key Management Service (AWS KMS) console, the page might fail to load resources or hang. The Private Access endpoints carry the console shell, not the service API calls that the console makes on your behalf. In a VPC without an internet gateway, those calls have nowhere to go.

Add a VPC endpoint for the service itself. For the pilot, create an AWS KMS interface endpoint (com.amazonaws.<region>.kms) in the same VPC, with Private DNS enabled. Open the AWS KMS console from inside the VPC and confirm the list of keys loads. Repeat for each service your users need on day one. Please note that a single service console often calls more than one AWS service API. If a console loads but parts of the page show errors or stay empty, the most common cause is a missing endpoint for one of the services it depends on.

The current list of services that support PrivateLink is in the AWS PrivateLink documentation. Service consoles whose services don’t support PrivateLink will not work in a no-internet VPC and need to be handled separately.

Step 8: Hide Regions and services you haven’t configured (optional)

Console links to a service or Region that you don’t have endpoints for will fail inside your VPC. To prevent users from navigating to broken pages, use User Experience Customization (UXC) to hide Regions and services that aren’t part of your Private Access deployment. UXC is configured at the account level and applies to navigation, search results, and service-selection drop-downs.

Step 9: Validate, then expand

After applying the endpoint policies and the Sign-In RCP to one pilot account:

1. Sign in from inside the corporate network. The session should succeed.
2. Sign in from outside the corporate network. The session should be denied at the Sign-In step, before reaching the console.
3. In CloudTrail, confirm ConsoleLogin events show vpcEndpointId populated for traffic from inside the network.
4. For unexpected denials, look in CloudTrail for ConsoleLogin events with the error message Authorization denied because of a resource-based policy or Authorization denied because of a resource control policy to identify which statement was responsible.

Considerations

A few items worth mentioning before you commit to this design:

• AWS IAM Identity Center: IAM Identity Center sign-in support isn’t yet available through a VPC endpoint. Initial single sign-on (SSO) authentication must still transit over the internet.
• Programmatic access: Sign-In RBPs and RCPs gate interactive console sign-in. AWS SDK and AWS CLI requests signed with SigV4 aren’t affected. This is also your recovery path: a principal with signin:DeleteConsoleAuthorizationConfiguration permission can disable enforcement programmatically if console authorization is misconfigured.
• Apps integrated with AWS Sign-In: Sign-In policies also apply to Amazon Connect, Amazon WorkSpaces, Amazon QuickSight, AWS Health Dashboard, Amazon AppStream 2.0, and Amazon Lightsail when those applications use AWS Sign-In to authenticate.
• AWS Management Console Private Access is available in all commercial AWS Regions but supports only a subset of AWS service consoles. See Supported AWS Regions, service consoles, and features in Private Access documentation for more information.
• For services that aren’t supported, you can still navigate to other consoles, but will require internet connectivity for the unsupported service consoles and console-only APIs.
• Costs: You pay regular AWS PrivateLink endpoint pricing and data processing for each endpoint and each Region you deploy in. The three Private Access endpoints (console, signin, and console-static) plus the service endpoints you already use are the relevant line items.

Conclusion

In this post, we showed you how to extend the AWS data perimeter framework to the AWS Management Console. You routed console traffic through VPC endpoints with AWS Management Console Private Access, restricted console sign-in by network and organization with Sign-In RBPs and RCPs, and configured the console to operate in a VPC without an internet gateway. The four control objectives that you already enforce for API traffic now also apply to the console.

To get started, see the AWS Management Console Private Access documentation. For deployment patterns and Region-by-Region considerations, see the AWS Management Console Private Access reference architectures. For background on the broader pattern, see Establishing a data perimeter on AWS.

If you have feedback about this post, submit comments in the Comments section below. If you have questions about this post, start a new thread on the IAM forum on AWS re:Post or contact AWS Support.

With the introduction of models that require data sharing with third-party providers—such as Claude Fable 5—organizations need a way to centrally enforce data retention policies. Amazon Bedrock gives you control over whether your prompts and model outputs are retained after an inference request completes. You might need a way to enforce your retention settings across all accounts and have granular control of project data retention when compatible with the selected model.

In this blog post, I walk you through how Amazon Bedrock data retention modes work, the tools available for managing retention—including Amazon Bedrock Projects and service control policies (SCPs)—and how to verify your policy settings are working correctly.

In this post, you will learn:

• How Amazon Bedrock data retention modes work and what each mode means for your data
• How to use Amazon Bedrock Projects with compatible models to isolate workloads with different retention needs
• How to write and deploy an SCP that prevents anyone in your organization from enabling data sharing
• How data retention modes interact with cross-Region inference profiles
• How to verify your configuration is working correctly

Understanding data retention modes

You can use Amazon Bedrock to control data retention through a mode setting on your account. This determines what happens to your prompts and outputs after each inference request, which is important to understand as you assess your compliance needs. Not all models require data retention or data sharing, and you might continue to use Amazon Bedrock with models that don’t require data retention or data sharing. See the Amazon Bedrock documentation for the current list of models that require data retention or data sharing. Ultimately, it’s your responsibility as the customer to select models that align with your compliance needs.

Important Note: To help stop the dissemination of child sexual abuse material (“CSAM”), Amazon Bedrock uses automated mechanisms to identify CSAM in model input/output. We may store and review flagged content to determine if it is CSAM for reporting purposes, even when mode is none.

The following modes govern how Amazon Bedrock handles your data:

Understanding mode as a ceiling, not a floor

The most important concept to understand: your configured mode is the upper limit of retention you’re willing to accept; it is not what every request will use. Setting your account to provider_data_share doesn’t mean all your requests suddenly start retaining and sharing data. Models that support zero data retention will still operate with zero retention regardless of your account-level setting.

Think of it as a permissions ceiling:

Key takeaway: Your mode setting declares the maximum level of data retention you will accept. Models that support zero retention will continue to operate that way regardless of your account setting. Amazon Bedrock is designed so that you do not get more retention than necessary just because your account mode allows it.

Important: provider_data_share isn’t inherited from a model—it’s an explicit opt-in at the account or project level. If your account is set to inherit or default, no model will trigger provider data sharing unless you configure it within your account or project.

Note on inherit behavior: The inherit mode defers to the next scope up in the hierarchy (project defers to account defers to service default). If a project is set to inherit and the account above it is set to provider_data_share, the project will inherit provider_data_share. You will not inherit provider_data_share from a model—that requires an explicit setting at the account or project level.

Note on APIs that require retention: Some Amazon Bedrock APIs require data retention to function regardless of model support, for example, the Batch API and the Responses API with store=true. Setting your mode to none will block these APIs. This is expected behavior: your ceiling of none means you require no retention, so APIs that can’t operate without retention are unavailable.

Why does provider_data_share exist?

Some foundation models require the provider_data_share mode to function. As AI models evolve, so must the mechanism to protect customers and the safety of their use. Models that require provider_data_share have allowed_modes: ["provider_data_share"], meaning they will appear as unavailable unless the account has explicitly opted in. This is by design: AWS requires you to make a conscious decision to share data before you as a customer can use these models. See the current list of models available through Amazon Bedrock and their retention requirements, which can change as new models are released.

If your regulatory requirements, internal policies, or customer commitments prohibit data sharing with third-party model providers, you can enforce this at multiple levels. Amazon Bedrock provides several tools for managing data retention, from fine-grained project-level settings to organization-wide enforcement.

Tools for managing data retention

Amazon Bedrock gives you multiple layers of control over data retention. You can use them independently or combine them for defense-in-depth:

Using Amazon Bedrock Projects for granular control

Not every workload in an account has the same data retention requirements. If you’re using the bedrock-mantle endpoint (OpenAI-compatible APIs), you can use Amazon Bedrock Projects to isolate traffic that can accept data retention from traffic that must not be retained—even within the same account.

For example, you might have:

• A research project where your team needs access to the latest models (including those requiring provider_data_share) for experimentation
• A production project handling customer data where zero retention is mandatory

With Amazon Bedrock Projects, you can set provider_data_share on the research project while keeping the production project locked to none. Each project enforces its own retention ceiling independently.

How project-level retention works:

• Each project can have its own data retention mode setting.
• A project set to inherit will inherit its mode from the account level.
• A project set to none enforces zero retention regardless of the account setting. Traffic routed through that project can’t trigger data sharing.
• A project set to provider_data_share allows models requiring data sharing, but only for requests within that project.

This gives organizations the flexibility to adopt new models incrementally while maintaining strict data governance on sensitive workloads. You can manage project settings using the Amazon Bedrock console or the bedrock-mantle API.

Important: Amazon Bedrock Projects are only available on the bedrock-mantle endpoint. They work with models accessed using the OpenAI-compatible APIs (Responses, Chat Completions) and the Anthropic Messages API on the mantle endpoint. Not all models are available on bedrock-mantle; check the endpoint availability by models page for current support.

Workload isolation on the bedrock-runtime endpoint

If you’re using the bedrock-runtime endpoint (Invoke, Converse APIs), project-level data retention isn’t available. The account-level retention mode applies to all requests made through bedrock-runtime.

To achieve workload-level isolation on bedrock-runtime, use separate AWS accounts:

• Place workloads that need provider_data_share in one account (or OU) without the SCP
• Place workloads that require zero retention in a separate account (or OU) with the SCP applied

You can use AWS Organizations OUs to group accounts by retention policy and apply SCPs selectively:

Organization Root
├── OU: Zero-Retention (SCP attached — blocks provider_data_share)
│   ├── Account: Production-App-A
│   └── Account: Production-App-B
└── OU: Research (no SCP — allows provider_data_share)
    └── Account: ML-Experimentation

Combining projects with SCPs: If you use an SCP to enforce none at the organization level, it overrides all project-level settings on bedrock-mantle. For accounts where you want project-level flexibility, don’t apply the SCP—use project-level isolation instead. For accounts that must never have data sharing under any circumstances, the SCP provides an unbypassable guarantee across both endpoints.

Using SCPs for organization-wide enforcement

For organizations that need an absolute guarantee that no account can enable data sharing—regardless of who has admin access or which endpoint they use—SCPs provide the strongest enforcement mechanism. SCPs apply to both the Amazon Bedrock control plane (bedrock:PutAccountDataRetention) and the mantle endpoint (bedrock-mantle:PutAccountDataRetention, bedrock-mantle:CreateProject, bedrock-mantle:UpdateProject).

Enforcing zero data retention with an SCP

In this section, I cover how you can use SCPs to manage your data retention policy. I introduce what an SCP is and provide some policies that you can use in your organization.

What is an SCP?

A service control policy (SCP) is a guardrail set at the organization level. It overrides every principal in the organization, including account administrators and root users. Even if someone has full admin permissions, an SCP deny can’t be overridden by an AWS Identity and Access Management (IAM) policy.

SCPs are managed in AWS Organizations and can be attached at different levels:

• Root – Applies to every account in the organization
• Organizational unit (OU) – Applies to all accounts in that OU
• Individual account – Applies only to that specific account

Important: The SCP must be attached to the root OU to cover all accounts. If attached to a child OU, accounts outside that OU will not be protected. Organization admin accounts don’t inherit SCP controls.

The SCP policy

The following policy prevents anyone in the organization from changing the Amazon Bedrock data retention mode to anything other than none.

Important: New accounts default to inherit (not none). Before attaching this SCP, you must explicitly set each account to none. Start by running the following in each account:

aws bedrock put-account-data-retention --region us-east-1 --mode none

If you have hundreds, or thousands of AWS accounts, you will need a way to scale this. See the AWS re:Post article Automate Bedrock Zero Data Retention Across All Accounts in Your Organization to learn how.

Amazon Bedrock policy:

This policy is used to restrict data retention to only be set to none. Any other value than none will be denied.

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "RESTRICTBEDROCKDATARETENTION",
            "Effect": "Deny",
            "Action": [
                "bedrock:PutAccountDataRetention"
            ],
            "Resource": "*",
            "Condition": {
                "StringNotEquals": {
                    "bedrock:DataRetentionMode": "none"
                }
            }
        }
    ]
}

How it works

The Condition block uses StringNotEquals, meaning the deny fires for any value that isn’t none. This ensures:

With all the preceding in place you might be wondering what this means for your organization:

• No one can enable data sharing with model providers – Even account administrators receive Access Denied
• Models requiring provider_data_share become permanently unavailable – Models that require data sharing (such as Claude Fable 5 and Claude Mythos 5, among others) will not work across the organization
• All other models continue to work normally – Models that support none mode are unaffected
• The setting cannot be bypassed – no IAM policy can override an SCP deny

Optional: Block project-level overrides

The bedrock-mantle endpoint supports project-level data retention settings. Without additional SCP coverage, someone could create or update a project with provider_data_share, bypassing the account-level restriction. To prevent this, extend your SCP to include the bedrock-mantle project actions:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "RESTRICTBEDROCKDATARETENTION",
            "Effect": "Deny",
            "Action": [
                "bedrock:PutAccountDataRetention",
                "bedrock-mantle:PutAccountDataRetention",
                "bedrock-mantle:CreateProject",
                "bedrock-mantle:UpdateProject"
            ],
            "Resource": "*",
            "Condition": {
                "StringNotEquals": {
                    "bedrock:DataRetentionMode": "none"
                }
            }
        }
    ]
}

Why doesn’t bedrock-runtime need project-level blocking? Projects don’t exist on the bedrock-runtime endpoint. The only way to change retention for bedrock-runtime traffic is the account-level bedrock:PutAccountDataRetention action, which the base SCP already blocks. The extra CreateProject and UpdateProject actions are only needed because bedrock-mantle allows per-project retention overrides; the project level control iisn’t required on bedrock-runtime.

Data retention and cross-Region inference

When using cross-Region inference profiles, it’s important to understand how data retention mode is evaluated: the mode is evaluated in the source AWS Region of your request, the Region where you make the API call. You don’t need to set the retention mode in every destination Region.

However, there’s an important caveat: while the mode check happens in your source Region, the data itself might be retained in the destination Region where the inference is processed. This is relevant for organizations tracking where retained data resides geographically.

What this means in practice

The following describes how this work in practice with data retention and inference.

• If your source Region (for example, us-east-1) is set to provider_data_share, requests using a cross-Region inference profile will be permitted, regardless of the retention setting in the destination Region
• If your source Region is set to none, requests to models requiring provider_data_share will be blocked at the source, before the request is ever routed to a destination Region
• SCPs continue to apply globally, a single SCP at the root OU blocks provider_data_share in every Region automatically

SCPs are global

While data retention settings are helpful for granular control of data retention settings itself, SCPs can be used to apply data retention settings globally across all Regions automatically. A single SCP attached to the root OU blocks provider_data_share in every Region without needing to configure anything per-region. This is one of the key advantages of using an SCP for enforcement rather than relying on manual configuration.

Verify your configuration

You can verify your data retention settings and SCP enforcement using the AWS Software Development Kit, AWS Command Line Interface (AWS CLI), or the Amazon Bedrock console.

Check your current retention mode

The following provides are options that you can use for checking your current retention mode.

Using the Amazon Bedrock console:

In the AWS Management Console, go to Amazon Bedrock and choose Settings, and then choose Data retention. Here, you can see the current account-level retention mode and change it directly.

Using the AWS CLI (requires CLI version 2.35+):

aws bedrock get-account-data-retention --region us-east-1

Expected response:

{
  "mode": "none",
  "updatedAt": "2026-07-01T01:58:34.684Z"
}

Using the bedrock-mantle API (using a Bedrock API key):

curl https://bedrock-mantle.us-east-1.api.aws/v1/data_retention \
	-H "x-api-key: $BEDROCK_API_KEY"

Expected response:

{
  "mode": "none",
  "updated_at": 1719792000
}

Check a model’s effective mode and allowed modes

You can also use the bedrock-mantle API to check what retention mode is in effect for a specific model, and which modes that model supports:

curl https://bedrock-mantle.us-east-1.api.aws/v1/models/anthropic.claude-fable-5 \ 
  -H "x-api-key: $BEDROCK_API_KEY

Response:

{
  "id": "anthropic.claude-fable-5",
  "status": "available",
  "data_retention": {
    "mode": "provider_data_share",
    "source": "account",
    "allowed_modes": ["provider_data_share"]
  }
}

If the model shows "status": "unavailable", the status_reason field will explain the retention mode conflict.

Verify the SCP is working

To confirm your SCP is actively blocking data retention changes, attempt to set the mode to provider_data_share:

Using AWS CLI:

aws bedrock put-account-data-retention \
  --region us-east-1 \
  --mode provider_data_share

Using bedrock-mantle API:

curl -X PUT https://bedrock-mantle.us-east-1.api.aws/v1/data_retention \
  -H "x-api-key: $BEDROCK_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "mode": "provider_data_share" }'

If the SCP is working, you’ll receive an Access Denied error:

An error occurred (AccessDeniedException) when calling the PutAccountDataRetention operation:
User: arn:aws:iam::123456789012:user/admin is not authorized to perform:
bedrock:PutAccountDataRetention with an explicit deny in a service control policy

If the SCP is not working, the request will succeed. If this happens, immediately revert:

aws bedrock put-account-data-retention \
  --region us-east-1 \
  --mode none

Then troubleshoot your SCP attachment:

• Verify the SCP is attached to the root OU, not a child OU
• Check the SCP policy syntax and condition keys
• Remember: the AWS Organizations management account is exempt from SCPs—use an IAM policy to enforce policies on that account

Enable data retention for models that require it

For accounts where you want to use models requiring provider_data_share (accounts where the SCP isn’t applied), set the mode using AWS CLI, the API, or the console:

Using AWS CLI:

aws bedrock put-account-data-retention \
  --region us-east-1 \
  --mode provider_data_share

Using bedrock-mantle API:

curl -X PUT https://bedrock-mantle.us-east-1.api.aws/v1/data_retention \
  -H "x-api-key: $BEDROCK_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "mode": "provider_data_share" }'

You can also do this in the Bedrock console in Data retention , under Settings.

Reset data retention back to none

To revert to zero data retention:

Using AWS CLI:

aws bedrock put-account-data-retention \
  --region us-east-1 \
  --mode none

Using bedrock-mantle API:

curl -X PUT https://bedrock-mantle.us-east-1.api.aws/v1/data_retention \
  -H "x-api-key: $BEDROCK_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "mode": "none" }'

Manage project-level data retention

You can set data retention at the project level to allow different workloads within the same account to have different retention policies. Update a project’s data retention mode using the bedrock-mantle API:

# Set a project to provider_data_share
curl -X POST https://bedrock-mantle.us-east-1.api.aws/v1/organization/projects/proj_abc123 \
  -H "x-api-key: $BEDROCK_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "data_retention": { "mode": "provider_data_share" } }'

# Set a project to none (zero retention)
curl -X POST https://bedrock-mantle.us-east-1.api.aws/v1/organization/projects/proj_abc123 \
  -H "x-api-key: $BEDROCK_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "data_retention": { "mode": "none" } }'

# Check a project's current setting
curl -X POST https://bedrock-mantle.us-east-1.api.aws/v1/organization/projects/proj_abc123 \
  -H "x-api-key: $BEDROCK_API_KEY"

How project-level retention resolves: The effective mode for any request is determined by taking the first non-inherit value in the project, account, model default hierarchy. If your project is set to none, it enforces zero retention regardless of the account setting. If your project is set to inherit, it defers to the account-level setting.

Note: Project-level data retention is managed exclusively through the bedrock-mantle API. There is no AWS CLI command for project-level settings. The preceding AWS CLI commands only manage the account-level setting through the Amazon Bedrock control plane.

Conclusion

In this post, I showed you the various methods for managing data retention within Amazon Bedrock, including project-level data retention and organization wide control you can implement using SCPs. Choose the combination that matches your requirements and consult the Amazon Bedrock documentation to confirm each model’s mode requirements before deployment.

For more information about Amazon Bedrock data retention, see the data retention documentation. For SCPs, see service control policies in the AWS Organizations User Guide.

Additional resources

• Amazon Bedrock data retention – Full documentation on retention modes, configuration, and IAM enforcement
• Cross-Region inference profiles – Understanding how inference routes across AWS Regions
• Amazon Bedrock abuse detection – What data is retained for safety purposes
• Fallback credit for refused requests – How billing works when Fable 5 falls back to Opus 4.8
• Claude Fable 5 and Mythos 5 announcement – Anthropic’s explanation of the new data retention policy
• Anthropic Data Processing Addendum – Legal terms governing data shared with Anthropic
• Service control policies (SCPs) – AWS Organizations documentation

Try the examples in this post and send feedback to AWS re:Post for Amazon Bedrock or through your usual AWS Support contacts.

Amazon Web Services (AWS) recently announced support for resource-based policies and resource control policies (RCPs) for AWS Sign-In. By using resource-based policies and RCPs, you can restrict access to the AWS Management Console sign-in and aws login CLI sessions to requests from your expected networks, your on-premises data center networks, and your Amazon Virtual Private Cloud (Amazon VPC) VPCs.

Sign-in resource-based policies and RCPs support several security objectives: restricting console sign-in to corporate networks, limiting which principals can sign-in to the console, and applying consistent network perimeter controls across an entire AWS Organizations organization.

In this post, we walk through a common use case: a financial services company restricting console access to its corporate network for regulatory compliance. We show you how to implement this using a sign-in resource-based policy for a single account, verify the controls with AWS CloudTrail, and explain how these policies integrate with AWS Management Console Private Access and the broader AWS data perimeter framework.

Consider a financial services company that requires access to AWS Management Console sign-in to originate from the corporate network. The company has the following requirements:

• Users sign in to the console only from the corporate VPN, office network, or customer VPC.
• Sign-in attempts from personal networks, public Wi-Fi, or other unexpected locations must be denied.
• A designated principal should retain access from any network to prevent lockout.
• All sign-in attempts (allowed and denied) must be logged to CloudTrail for compliance evidence.

In the steps that follow, we show you how to create a resource-based policy to enforce these requirements on a single account.

• AWS Command Line Interface (AWS CLI) installed and configured with the latest version.
• Permission to manage Sign-in resource policies. Attach the AWS managed policy AWSSignInResourcePolicyManagement or grant permissions to the following actions to respective principals:
  • Manage resource permission statements: signin:PutResourcePermissionStatement, signin:DeleteResourcePermissionStatement, signin:ListResourcePermissionStatements, signin:GetResourcePolicy.
  • Manage console authorization: signin:PutConsoleAuthorizationConfiguration, signin:GetConsoleAuthorizationConfiguration, signin:DeleteConsoleAuthorizationConfiguration
• Identified corporate network: IP CIDR range or VPC ID.
• Designated principal Amazon Resource Name (ARN) to exclude, so it retains access if network conditions change.

Note: For the complete list of AWS Sign-In actions see Actions, resources, and condition keys for AWS Sign-In in the Service Authorization Reference.

Most resource-based policies require the author to input the full policy document (JSON statements). A Sign-in resource permission statement is different: you provide parameters, and AWS Sign-In generates the policy for you.

The following command provides your corporate IP range, your VPC, and an excluded principal as parameters. AWS Sign-In uses these parameters to generate a policy that restricts console sign-in to those networks, while letting the excluded principal sign in from any network. You control the parameter values, not the policy structure. You can review the generated policy at any time with the get-resource-policy command.

Note: Creating resource permission statements has no effect until console authorization is enabled in Step 2, so you can review the complete policy before it takes effect. Write operations must target us-east-1.

To create resource permission statements

1. Open your terminal and ensure you have the latest AWS CLI installed.
2. Run the following command, replacing the placeholder values <my-vpc>, <my-vpc-region>, <my-corporate-cidr>, and <excluded-IAM-principal-arn> with your specific configuration:

aws signin put-resource-permission-statement \
  --source-vpc <my-vpc> \
  --requested-region <my-vpc-region> \
  --source-ip <my-corporate-cidr> \
  --excluded-principal <excluded-IAM-principal-arn> \
  --region us-east-1

3. Verify the command succeeded by checking for a statementId in the output.

Example output:
{
“statementId":"b2HfHli9qCF1P4eGNll13CrZtusXlcPxxVBqz2aYLjlAcWtWQHP6Hg0"
}

4. Review the complete resource-based policy by running get-resource-policy command.

aws signin get-resource-policy

Example output:

{
  "signinResourceBasedPolicy": {
    "Version": "2012-10-17",
    "Statement": [
      {
        "Effect": "DENY",
        "Principal": {"AWS": "*"},
        "Action": ["signin:Authenticate"],
        "Resource": "*",
        "Condition": {
          "ArnNotEquals": {"signin:PrincipalArn": ["<excluded-IAM-principal-arn>"]},
          "NotIpAddress": {"aws:SourceIp": ["<my-corporate-cidr>"]},
          "StringEquals": {"aws:ResourceAccount": ["<account-id>"]},
          "StringNotEquals": {"aws:SourceVpc": ["<my-vpc>"]}
        }
      },
      {
        "Effect": "DENY",
        "Principal": {"AWS": "*"},
        "Action": ["signin:CreateOAuth2Token", "signin:AuthorizeOAuth2Access"],
        "Resource": "*",
        "Condition": {
          "ArnNotEquals": {"aws:PrincipalArn": ["<excluded-IAM-principal-arn>"]},
          "NotIpAddress": {"aws:SourceIp": ["<my-corporate-cidr>"]},
          "StringEquals": {"aws:ResourceAccount": ["<account-id>"]},
          "StringNotEquals": {"aws:SourceVpc": ["<my-vpc>"]}
        }
      },
      {
        "Effect": "DENY",
        "Principal": {"AWS": "*"},
        "Action": ["signin:Authenticate"],
        "Resource": "*",
        "Condition": {
          "ArnNotEquals": {"signin:PrincipalArn": ["<excluded-IAM-principal-arn>"]},
          "StringEquals": {"aws:SourceVpc": ["<my-vpc>"]},
          "StringNotEquals": {"aws:RequestedRegion": ["<my-vpc-region>"]}
        }
      },
      {
        "Effect": "DENY",
        "Principal": {"AWS": "*"},
        "Action": ["signin:CreateOAuth2Token", "signin:AuthorizeOAuth2Access"],
        "Resource": "*",
        "Condition": {
          "ArnNotEquals": {"aws:PrincipalArn": ["<excluded-IAM-principal-arn>"]},
          "StringEquals": {"aws:SourceVpc": ["<my-vpc>"]},
          "StringNotEquals": {"aws:RequestedRegion": ["<my-vpc-region>"]}
        }
      }
    ]
  }
}

The generated policy contains four statements, grouped into two pairs. The first pair restricts access by network source—it denies any principal making a request from outside your corporate IP range (<my-corporate-cidr>) or your VPC (<my-vpc>). The second pair restricts which AWS Region your VPC can target—it denies requests originating from <my-vpc> unless they are directed at <my-vpc-region>. This Region binding is necessary because VPC IDs are only unique within a single Region.

AWS Sign-In evaluates these policies in two phases: before authentication and after authentication. The post-authentication evaluation repeats each time the console session requests new credentials. Within each pair, one statement covers the pre-authentication phase and one covers the post-authentication phase.

The pre-authentication statement evaluates the signin:Authenticate action. Since the principal is not yet authenticated in this phase, the statement uses the signin:PrincipalArn condition key to exempt your excluded principal. This key supports all principal types: root user, AWS Identity and Access Management (IAM) user, federated user, and role.

The post-authentication statement evaluates the signin:AuthorizeOAuth2Access and signin:CreateOAuth2Token actions. AWS Sign-In evaluates these actions after authentication, when it issues the tokens that establish the console session. These actions do not support the signin:PrincipalArn key. Instead, they use aws:PrincipalArn, which resolves to the authenticated principal.

The aws:ResourceAccount value is the recipient account ID. AWS Sign-In pulls it automatically from your caller credentials, so you do not set it yourself. For the full list of supported actions and condition keys, including which keys apply at each phase and to each principal type, see Controlling console access with resource-based policies and resource control policies and AWS Sign-In condition keys reference.

This step turns on enforcement of the policy you created in Step 1. Until you run this step, the resource permission statements you created in Step 1 have no effect.

5. Turn on enforcement of sign-in policies using the following command:

aws signin put-console-authorization-configuration \
  --target-id <account-id> \
  --region us-east-1

6. Verify the command succeeded by checking for a “consoleAuthorizationEnabled": true in the output.

Example output:

{
“Output": {
“consoleAuthorizationEnabled": true,
“scope": “ACCOUNT”,
“targetId": "<account-id>"
}
}

7. You can also verify the configuration by executing the get-console-authorization-configuration command as shown below:

aws signin get-console-authorization-configuration \
  --target-id <account-id> \
  --region us-east-1

8. To disable enforcement or remove individual statements, use delete-console-authorization-configuration or delete-resource-permission-statement. For more details, see Controlling console access with resource-based policies and resource control policies in the AWS Sign-In User Guide.

Now that enforcement is active, sign-in attempts are evaluated against your resource-based policy. Verify the behavior by testing sign-in from different network conditions.

A principal signing in from the allowed corporate IP range or VPC succeeds normally. The CloudTrail event shows ConsoleLogin:Success

Example CloudTrail event details for successful console sign-in:

{
    "userIdentity": {
        "type": "AssumedRole",
        "principalId": "AROAEXAMPLEID:Dev1",
        "arn": "arn:aws:sts::123456789123:assumed-role/Developer/Dev1",
        "accountId": "123456789123"
    },
    "eventTime": "2026-06-09T19:20:38Z",
    "eventSource": "signin.amazonaws.com",
    "eventName": "ConsoleLogin",
    "awsRegion": "us-east-1",
    "sourceIPAddress": "192.0.2.100",
    "responseElements": {
        "ConsoleLogin": "Success"
    },
    "eventID": "dd004e78-6447-4f56-8d2d-a795da66f598",
    "readOnly": false,
    "eventType": "AwsConsoleSignIn",
    "managementEvent": true,
    "recipientAccountId": "123456789123",
    "eventCategory": "Management"
}

A principal signing in from a network other than the allowed IP address range or a VPC endpoint attached to the source VPC, is blocked. The CloudTrail event shows ConsoleLogin: Failure with an error message identifying the policy that caused the denial:

Example CloudTrail event details for failed console sign-in:

{    
"userIdentity": {
    "type": "IAMUser",
    "accountId": "123456789123",
    "accessKeyId": "",
    "userName": "Dev1"
    },
    "eventTime": "2026-06-09T19:20:38Z",
    "eventSource": "signin.amazonaws.com",
    "eventName": "ConsoleLogin",
    "awsRegion": "us-east-1",
    "sourceIPAddress": "198.51.100.76",
    "userAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/148.0.0.0 Safari/537.36",
    "errorCode": "AccessDenied",
    "errorMessage": "Authorization denied because of a resource-based policy",
    "requestParameters": null,
    "responseElements": {
        "ConsoleLogin": "Failure"
    },
"eventID": "d88a7543-ae89-4186-b1b6-d3116413f2ee",
"readOnly": false,
"eventType": "AwsConsoleSignIn",
"managementEvent": true,
"recipientAccountId": "123456789123",
"eventCategory": "Management"
}

The error message field shows the policy type that caused the denial: “Authorization denied because of a resource-based policy”.

The steps above apply a Sign-in resource-based policy to a single account. For organizations managing many accounts, RCPs offer a better path: they can be attached at the organization, OU, or account level in AWS Organizations and apply automatically to every account in scope. To view an RCP example, see here .

When a sign-in to the console is denied because of an RCP, the error message field shows the denial as “Authorization denied because of a resource control policy”.

The sign-in resource-based policy you created controls which networks can reach your account’s sign-in flow. AWS Management Console Private Access adds a complementary control: from within your network, it limits console access to a known set of AWS accounts, preventing sign-in to unexpected AWS accounts.

Together, these capabilities contribute to a data perimeter for console access:

• Network perimeter: Sign-in resource-based policies and RCPs restrict console sign-in to expected networks (corporate IP ranges, VPCs).
• Identity perimeter: Sign-in resource-based policy and RCP ensure only trusted identities can sign in to the console. Console VPC endpoint policy and Sign-in VPC endpoint policy ensure only trusted identities can use the console from your VPC.
• Resource perimeter: Sign-in VPC endpoint policy and Console VPC endpoint policy restrict which AWS accounts are reachable from your network.

The controls in this post focus on console access. To extend these perimeters to other AWS services and broader implementation scenarios, see the Data perimeter policy examples repository and the Data Perimeters Blog Post Series.

By using sign-in resource-based policies and RCPs, you can restrict AWS Management Console access to expected networks. These controls are available at no additional cost in all AWS commercial Regions.

To get started, see the AWS Sign-in User Guide. For organization-wide enforcement, see Resource control policies in the AWS Organizations User Guide.

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The AWS Customer Incident Response Team works with customers to help them recover from active security incidents. As part of this work, the team often uncovers new or trending tactics used by various threat actors that take advantage of specific customer configurations and designs.

Understanding these tactics can help inform your architecture decisions, improve your response plans, and detect these situations if they occur in your environment.

This post examines a new approach we’re seeing threat actors use after they gain control of a customer account, which is to remove it from the customer’s AWS Organizations implementation and the policies and protections that structure provides.

The described tactic doesn’t take advantage of vulnerabilities within AWS services, instead it uses an unexpected opportunity created by a specific configuration or design to make unauthorized use of resources within an AWS account.

This approach starts with the threat actor using credentials that have the organizations:LeaveOrganizationpermission grant. This permission provides access to the LeaveOrganizations API call, which, when called from a member account, attempts to remove that account from the organization.

It’s important to remember that while this approach might use a compromised root credential, threat actors can also use other methods to elevate their access until they have the required permission or the ability to assume a role that has this permission, or they have the ability to grant their current credential this permission. This is why a least privilege approach to authorization is critical to protect your environment. To learn more, see AWS Identity and Access Management (IAM) documentation and the AWS Organizations guidance on organizational unit (OU) design and service control policy (SCP) implementation.

After the account is removed from the organization, the restrictions inherited as a part of that organization—such as SCPs that were preventing destructive actions, limiting which AWS Regions could be used, or blocking specific API calls—no longer apply. The account is also no longer part of consolidated billing, so the organization’s billing alerts and cost anomaly detection will no longer cover activity in that account. AWS CloudTrail organization trails stop capturing events from the departed account, and Amazon GuardDuty findings managed through a delegated administrator will stop flowing to the central security account.

The result is frequently that the organization loses visibility into the account while it still contains resources for the organization. Related threat technique catalog entries:

• T1078.A002: Account Root User: Initial access using compromised root credentials
• T1078.004: Cloud Accounts: Initial access using compromised IAM credentials
• T1098: Account Manipulation: Privilege escalation and modifying account settings to maintain control
• T1666.A002: Leave AWS Organization: Removing a member account from the organization to bypass SCPs and governance controls
• T1562.008: Disable Cloud Logs: Loss of centralized logging visibility after leaving the organization

When an account attempts to leave an organization, at least two API calls are logged in CloudTrail: organizations:AcceptHandshake and organizations:LeaveOrganization. If you have centralized logging configured, these might be among the last events you see from the compromised account. After it leaves the organization, it might default to logging events within the account to its own CloudTrail logs. The following CloudTrail events are associated with accounts joining or leaving an organization. These should be investigated unless they’re part of an approved operational workflow that’s used by your teams to manage AWS Organizations.

Implement an SCP that denies the organizations:LeaveOrganization action. AWS Organizations provides detailed guidance on implementing this control, including the specific SCP policy JSON and advice on how to design your OU structure to accommodate legitimate account migrations while keeping the protection in place for production and development accounts.

SCPs act as guardrails that limit what any IAM policy can permit within member accounts. We strongly encourage every customer using AWS Organizations to verify whether this SCP is in place today and take steps to implement it if it is not. This SCP is quick to deploy and has minimal operational impact, providing a process to carefully manage and consider separating a member account from an organization.

Because this action can originate from any compromised IAM principal with the organizations:LeaveOrganization—not just root—the principle of least privilege for IAM permissions is an important complementary control. Limiting which users and roles can add, remove, or change policies, assume other roles, or modify their own permissions reduces the paths available for unauthorized permission changes. Regularly reviewing IAM policies for overly broad permissions—particularly iam:AttachRolePolicy, iam:AttachUserPolicy, iam:PutRolePolicy, and sts:AssumeRole with wide trust policies—will help reduce the scope of what a compromised principal can do.

Root account security remains important, because root compromise is a common entry point for this pattern. Enabling multi-factor authentication (MFA) on every root user, deleting any root access keys, and adopting centralized root access management to remove root credentials from member accounts entirely, will help reduce the risk.

This technique highlights a broader theme that we see across engagements: threat actors are increasingly aware of how AWS governance controls work, and they’re taking deliberate steps to separate accounts from the controls that an organization provides. Disabling AWS CloudTrail, deleting Amazon GuardDuty detectors, and removing accounts from organizations are all variations of the same strategy: removing your accounts from the guardrails and visibility that would otherwise constrain their activity and help the customer respond.

The controls to prevent this are available today and straightforward to implement. We encourage teams to start with the AWS Organizations service team’s guidance and implement the DenyLeaveOrganizationSCP—it’s the single highest-impact, lowest-effort control for this technique. Beyond that, reviewing SCP coverage across your OU structure, verifying that both root credentials and IAM permissions are properly secured across all member accounts, and ensuring that your detection and response processes account for this technique will contribute to a stronger posture. The Threat Technique Catalog for AWS includes detection guidance for the underlying techniques.

• Threat Technique Catalog for AWS – Matrix
• T1078.A002: Account Root User
• T1078.004: Cloud Accounts
• T1098: Account Manipulation
• T1666.A002: Leave AWS Organization
• Essential security controls to prevent unauthorized account removal in AWS Organizations
• Centrally manage root access for member accounts
• AWS Organizations Service Control Policies
• Amazon GuardDuty
• AWS CloudTrail User Guide

If you have feedback about this post, submit comments in the Comments section below.