This is amazing:

Opus 4.6 is notably better at finding high-severity vulnerabilities than previous models and a sign of how quickly things are moving. Security teams have been automating vulnerability discovery for years, investing heavily in fuzzing infrastructure and custom harnesses to find bugs at scale. But what stood out in early testing is how quickly Opus 4.6 found vulnerabilities out of the box without task-specific tooling, custom scaffolding, or specialized prompting. Even more interesting is how it found them. Fuzzers work by throwing massive amounts of random inputs at code to see what breaks. Opus 4.6 reads and reasons about code the way a human researcher would­—looking at past fixes to find similar bugs that weren’t addressed, spotting patterns that tend to cause problems, or understanding a piece of logic well enough to know exactly what input would break it. When we pointed Opus 4.6 at some of the most well-tested codebases (projects that have had fuzzers running against them for years, accumulating millions of hours of CPU time), Opus 4.6 found high-severity vulnerabilities, some that had gone undetected for decades.

The details of how Claude Opus 4.6 found these zero-days is the interesting part—read the whole blog post.

News article.

SmarterTools says customers were impacted after hackers compromised a data center used for quality control testing.

The post SmarterTools Hit by Ransomware via Vulnerability in Its Own Product appeared first on SecurityWeek.

The KEV list is useful but largely misunderstood. KEVology explains what it is, and how best to use it.

The post New Paper and Tool Help Security Teams Move Beyond Blind Reliance on CISA’s KEV Catalog appeared first on SecurityWeek.

The signs of a cyberattack were identified on systems EU's main executive body uses for mobile device management.

The post European Commission Investigating Cyberattack appeared first on SecurityWeek.

Edge devices that are no longer supported have been targeted in attacks by state-sponsored hackers, the US says.

The post Organizations Urged to Replace Discontinued Edge Devices appeared first on SecurityWeek.

As breach costs go up and attackers focus on common web features like dashboards, admin panels, customer portals, and APIs, weak access control quickly leads to lost data, broken trust, and costly incidents. The worst part is that many failures are not rare technical flaws but simple mistakes, such as missing permission checks, roles with too much power, or predictable IDs in URLs.

This post aims to help you control who can access different parts of your website and explain why it matters. 

Continue reading Beyond Login Screens: Why Access Control Matters at Sucuri Blog.

This is a video of advice for squid fishing in Puget Sound.

As usual, you can also use this squid post to talk about the security stories in the news that I haven’t covered.

Blog moderation policy.

Once. Someone named “Vincenzo lozzo” wrote to Epstein in email, in 2016: “I wouldn’t pay too much attention to this, Schneier has a long tradition of dramatizing and misunderstanding things.” The topic of the email is DDoS attacks, and it is unclear what I am dramatizing and misunderstanding.

Rabbi Schneier is also mentioned, also incidentally, also once. As far as either of us know, we are not related.

EDITED TO ADD (2/7): There is more context on the Justice.gov website version.

404Media is reporting that the FBI could not access a reporter’s iPhone because it had Lockdown Mode enabled:

The court record shows what devices and data the FBI was able to ultimately access, and which devices it could not, after raiding the home of the reporter, Hannah Natanson, in January as part of an investigation into leaks of classified information. It also provides rare insight into the apparent effectiveness of Lockdown Mode, or at least how effective it might be before the FBI may try other techniques to access the device.

“Because the iPhone was in Lockdown mode, CART could not extract that device,” the court record reads, referring to the FBI’s Computer Analysis Response Team, a unit focused on performing forensic analyses of seized devices. The document is written by the government, and is opposing the return of Natanson’s devices.

The FBI raided Natanson’s home as part of its investigation into government contractor Aurelio Perez-Lugones, who is charged with, among other things, retention of national defense information. The government believes Perez-Lugones was a source of Natanson’s, and provided her with various pieces of classified information. While executing a search warrant for his mobile phone, investigators reviewed Signal messages between Pere-Lugones and the reporter, the Department of Justice previously said.

Potential breach at Flickr exposes usernames, email addresses, IP addresses, and activity data.

The post Flickr Security Incident Tied to Third-Party Email System appeared first on SecurityWeek.

Living off the AI isn’t a hypothetical but a natural continuation of the tradecraft we’ve all been defending against, now mapped onto assistants, agents, and MCP.

The post Living off the AI: The Next Evolution of Attacker Tradecraft appeared first on SecurityWeek.

Other noteworthy stories that might have slipped under the radar: AT&T and Verizon response to Salt Typhoon, AI agents solve security challenges, man arrested in Poland for DDos Attacks.

The post In Other News: Record DDoS, Epstein’s Hacker, ESET Product Vulnerabilities appeared first on SecurityWeek.

The startup aims to unify SOC, GRC, IAM, vulnerability management, IT, and business operations through its Agentic OS platform.

The post Airrived Emerges From Stealth With $6.1 Million in Funding appeared first on SecurityWeek.

Used since at least 2019, DKnife has been targeting the desktop, mobile, and IoT devices of Chinese users.

The post ‘DKnife’ Implant Used by Chinese Threat Actor for Adversary-in-the-Middle Attacks appeared first on SecurityWeek.

The news comes after the Department of Energy conducted its annual Liberty Eclipse cybersecurity exercise.

The post 5 Bills to Boost Energy Sector Cyber Defenses Clear House Panel appeared first on SecurityWeek.

The security defect allows unauthenticated attackers to execute arbitrary code remotely via malicious HTTP requests.

The post Critical SmarterMail Vulnerability Exploited in Ransomware Attacks appeared first on SecurityWeek.

CISA updated 59 KEV entries in 2025 to specify that the vulnerabilities have been exploited in ransomware attacks.

The post Concerns Raised Over CISA’s Silent Ransomware Updates in KEV Catalog appeared first on SecurityWeek.

Zscaler says the acquisition will allow customers to embed lightweight extensions into any browser, providing increased security and eliminating the need for third-party browsers. 

The post Zscaler Acquires Browser Security Firm SquareX  appeared first on SecurityWeek.

The hacker claims to have stolen nearly 700,000 Substack user records, including email addresses and phone numbers.

The post Substack Discloses Security Incident After Hacker Leaks Data appeared first on SecurityWeek.