CISA has added CVE-2026-111357 and CVE-2026-118527 to its KEV catalog after the Ivanti VPN flaws were chained in zero-day attacks.
The post Ivanti Patches Two More Zero-Days Exploited in Connect Secure Attack Chain appeared first on SecurityWeek.
Justin.sh is reporting on a confidential Cellebrite document that has been leaked to him:
Cellebrite calls it Advanced Unlocks (AU from here on), not to be confused with the “advanced unlocking services” they’ve marketed for years. A press release from earlier this year confirms AU is a new product for 2026.
[…]
According to Cellebrite, AU:
- is a “next-generation AFU vector that is more resilient to Apple’s OS changes”
- works with Stolen Device Protection enabled, which tightens USB restrictions
- is enabled by a dedicated appliance with a stated range (!) of about 8 meters.
AU = Advanced Unlocks, Cellebrite’s term. AFU = after first unlock.
Citrix has confirmed that a new zero-day vulnerability, CVE-2026-88779, emerged just days after two other exploited flaws were patched.
The post Exploitation of Citrix NetScaler Zero-Day Hits Appliances Patched Days Earlier appeared first on SecurityWeek.
CVE-2026-104286 is a critical-severity path traversal vulnerability that could allow attackers to write arbitrary files to the system.
The post Exploited Fortinet FortiMail Zero-Day Calls for Urgent Action appeared first on SecurityWeek.
Mac security researcher Patrick Wardle says it’s trivial to turn Muse into “the ultimate backdoor.”
Increasingly, AI assistants are changing from tools that simply answer questions into agents that can plan tasks, use connected services, and take actions for us. These actions might include booking appointments, filling out forms, creating documents, making purchases, or interacting with email and calendars.
To do that, they need more permissions, account connections, and sensitive data. So, when Meta promised that “Muse is built from the ground up for privacy and security,” we did not expect an AI agent that can easily be manipulated into handing all that access to an attacker.
Meta says Muse can handle appointments, forms, customer-service interactions, purchases, document creation, and connections to services such as WhatsApp, email, calendars, and social platforms. It may also receive macOS permissions to access protected resources, including files, the microphone, camera, location, and calendars.
According to Ars Technica, Wardle found that a locally running application or terminal command could alter an undocumented Muse configuration setting that controls the server used for dictation transcription. By redirecting dictation traffic to an attacker-controlled server, an attacker could capture voice prompts and obtain the authentication token for the victim’s Muse account.
This is not a remote-code-execution vulnerability that can compromise an otherwise clean Mac. The attacker first needs a way to run code locally, such as through malware, a malicious application, or social engineering.
But as we have seen with infostealer malware finding its way onto Macs, that initial access is far from impossible.
Traditional infostealer malware must independently locate browser data, credentials, documents, chat histories, and other valuable material. A compromised AI agent could lower that barrier by bundling access to multiple services and operating-system permissions behind one already authenticated interface.
Ultimately, this is not just about one unsafe configuration setting. It shows why AI agents need a higher security standard than ordinary apps.
Wardle’s advice about Muse is simple: “Please don’t install.”
The same caution should apply to other AI agents.
The Open Worldwide Application Security Project (OWASP), a nonprofit foundation that provides free application-security guidance, lists prompt injection, tool abuse, privilege escalation, data exfiltration, excessive autonomy, memory poisoning, and sensitive-data exposure among the major security risks posed by AI agents.
A useful rule is that an AI agent should not have more access than it needs, and it should not be able to turn untrusted instructions into sensitive actions without meaningful checks. In practice, this means:
You should also protect your device against malware:
From reporting threats to removing them.
Cybersecurity risks should never spread beyond a headline. Keep threats off your devices by downloading Malwarebytes today.
Apple released iOS and macOS updates to patch a zero-day vulnerability (CVE-2026-86950) reported by Meta’s product security team.
The post Apple Patches Zero-Day Linked to ‘Extremely Sophisticated Attack’ appeared first on SecurityWeek.
Mac security researcher Patrick Wardle says it’s trivial to turn Muse into “the ultimate backdoor.”
Increasingly, AI assistants are changing from tools that simply answer questions into agents that can plan tasks, use connected services, and take actions for us. These actions might include booking appointments, filling out forms, creating documents, making purchases, or interacting with email and calendars.
To do that, they need more permissions, account connections, and sensitive data. So, when Meta promised that “Muse is built from the ground up for privacy and security,” we did not expect an AI agent that can easily be manipulated into handing all that access to an attacker.
Meta says Muse can handle appointments, forms, customer-service interactions, purchases, document creation, and connections to services such as WhatsApp, email, calendars, and social platforms. It may also receive macOS permissions to access protected resources, including files, the microphone, camera, location, and calendars.
According to Ars Technica, Wardle found that a locally running application or terminal command could alter an undocumented Muse configuration setting that controls the server used for dictation transcription. By redirecting dictation traffic to an attacker-controlled server, an attacker could capture voice prompts and obtain the authentication token for the victim’s Muse account.
This is not a remote-code-execution vulnerability that can compromise an otherwise clean Mac. The attacker first needs a way to run code locally, such as through malware, a malicious application, or social engineering.
But as we have seen with infostealer malware finding its way onto Macs, that initial access is far from impossible.
Traditional infostealer malware must independently locate browser data, credentials, documents, chat histories, and other valuable material. A compromised AI agent could lower that barrier by bundling access to multiple services and operating-system permissions behind one already authenticated interface.
Ultimately, this is not just about one unsafe configuration setting. It shows why AI agents need a higher security standard than ordinary apps.
Wardle’s advice about Muse is simple: “Please don’t install.”
The same caution should apply to other AI agents.
The Open Worldwide Application Security Project (OWASP), a nonprofit foundation that provides free application-security guidance, lists prompt injection, tool abuse, privilege escalation, data exfiltration, excessive autonomy, memory poisoning, and sensitive-data exposure among the major security risks posed by AI agents.
A useful rule is that an AI agent should not have more access than it needs, and it should not be able to turn untrusted instructions into sensitive actions without meaningful checks. In practice, this means:
You should also protect your device against malware:
From reporting threats to removing them.
Cybersecurity risks should never spread beyond a headline. Keep threats off your devices by downloading Malwarebytes today.
Unit 42 is aware of possible 0-day activity against NetScaler devices. Citrix reports CVE-2026-88771, CVE-2026-88772 have been exploited in the wild.
The post Threat Brief: NetScaler Zero Days CVE-2026-88771 and CVE-2026-88772 Exploited in the Wild (Updated September 30) appeared first on Unit 42.
Citrix has released patches for the critical NetScaler vulnerabilities tracked as CVE-2026-88771 and CVE-2026-88772.
The post Citrix Confirms 2 NetScaler Zero-Days After Admins Pulled the Plug appeared first on SecurityWeek.
Google’s Chrome 152 security update resolves 12 vulnerabilities, including a high-severity type confusion flaw in the V8 engine.
The post Google Patches 6th Chrome Zero-Day of 2026 appeared first on SecurityWeek.
Frontier AI is reshaping vulnerability discovery. Learn how our NOVA system found 14,000+ unknown vulnerabilities across the open-source software supply chain.
The post The Frontier AI Vulnerability Burst: Industrializing Autonomous Zero-Day Discovery in Open-Source Software appeared first on Unit 42.
The researcher stripped the proof-of-concept (PoC) exploit to prevent immediate exploitation of the vulnerability.
The post Nightmare Eclipse Drops ‘LegacyHive’ Windows Zero-Day appeared first on SecurityWeek.
The public PoC code exploits a race condition in Microsoft Defender to spawn a command prompt with System privileges.
The post Microsoft Working on Patch for ‘RoguePlanet’ Zero-Day appeared first on SecurityWeek.
An anonymous security researcher called “Nightmare Eclipse” has been publishing a series of significant security exploits against Microsoft Windows—including one that breaks BitLocker. Microsoft has threatened legal action against the researcher. Lots of recriminations are being traded back and forth.
The bugs could be exploited to elevate privileges to System or create a denial-of-service (DoS) condition.
The post Microsoft Patches Exploited UnDefend and RedSun Defender Zero-Days appeared first on SecurityWeek.
It’s nasty, but it requires physical access to the computer:
The exploit, named YellowKey, was published earlier this week by a researcher who goes by the alias Nightmare-Eclipse. It reliably bypasses default Windows 11 deployments of BitLocker, the full-volume encryption protection Microsoft provides to make disk contents off-limits to anyone without the decryption key, which is stored in a secured piece of hardware known as a trusted platform module (TPM). BitLocker is a mandatory protection for many organizations, including those that contract with governments.
Slashdot thread. And here’s Nightmare-Eclipse’s GitHub account.
Unit 42 details CVE-2026-0300, a buffer overflow vulnerability in the PAN-OS User-ID Authentication Portal. Read now for details.
The post Threat Brief: Exploitation of PAN-OS Captive Portal Zero-Day for Unauthenticated Remote Code Execution appeared first on Unit 42.
DarkSword is a sophisticated piece of malware—probably government designed—that targets iOS.
Google Threat Intelligence Group (GTIG) has identified a new iOS full-chain exploit that leveraged multiple zero-day vulnerabilities to fully compromise devices. Based on toolmarks in recovered payloads, we believe the exploit chain to be called DarkSword. Since at least November 2025, GTIG has observed multiple commercial surveillance vendors and suspected state-sponsored actors utilizing DarkSword in distinct campaigns. These threat actors have deployed the exploit chain against targets in Saudi Arabia, Turkey, Malaysia, and Ukraine.
DarkSword supports iOS versions 18.4 through 18.7 and utilizes six different vulnerabilities to deploy final-stage payloads. GTIG has identified three distinct malware families deployed following a successful DarkSword compromise: GHOSTBLADE, GHOSTKNIFE, and GHOSTSABER. The proliferation of this single exploit chain across disparate threat actors mirrors the previously discovered Coruna iOS exploit kit. Notably, UNC6353, a suspected Russian espionage group previously observed using Coruna, has recently incorporated DarkSword into their watering hole campaigns.
A week after it was identified, a version of it leaked onto the internet, where it is being used more broadly.
This news is a month old. Your devices are safe, assuming you patch regularly.
That’s a lot. No, it’s an extraordinary number:
Since February, the Firefox team has been working around the clock using frontier AI models to find and fix latent security vulnerabilities in the browser. We wrote previously about our collaboration with Anthropic to scan Firefox with Opus 4.6, which led to fixes for 22 security-sensitive bugs in Firefox 148.
As part of our continued collaboration with Anthropic, we had the opportunity to apply an early version of Claude Mythos Preview to Firefox. This week’s release of Firefox 150 includes fixes for 271 vulnerabilities identified during this initial evaluation.
As these capabilities reach the hands of more defenders, many other teams are now experiencing the same vertigo we did when the findings first came into focus. For a hardened target, just one such bug would have been red-alert in 2025, and so many at once makes you stop to wonder whether it’s even possible to keep up.
Our experience is a hopeful one for teams who shake off the vertigo and get to work. You may need to reprioritize everything else to bring relentless and single-minded focus to the task, but there is light at the end of the tunnel. We are extremely proud of how our team rose to meet this challenge, and others will too. Our work isn’t finished, but we’ve turned the corner and can glimpse a future much better than just keeping up. Defenders finally have a chance to win, decisively.
They’re right. Assuming the defenders can patch, and push those patches out to users quickly, this technology favors the defenders.
News article.
Unit 42 finds frontier AI models enhance vulnerability discovery, acting as full-spectrum security researchers. They enable autonomous zero-day discovery and faster N-day patching.
The post Fracturing Software Security With Frontier AI Models appeared first on Unit 42.
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