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Schneier - Claude Mythos Has Found 271 Zero-Days in Firefox

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 ...
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The Hacker News - CISA Adds Actively Exploited ConnectWise and Windows Flaws to KEV

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Tuesday added two security flaws impacting ConnectWise ScreenConnect and Microsoft Windows to its Known Exploited Vulnerabilities (KEV) catalog, based on evidence of active exploitation. The vulnerabilities are listed below - CVE-2024-1708 (CVSS score: 8.4) - A path traversal vulnerability in  ConnectWise ScreenConnect from The Hacker News https://thehackernews.com/2026/04/cisa-adds-actively-exploited.html
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The Hacker News - Brazilian LofyGang Resurfaces After Three Years With Minecraft LofyStealer Campaign

A cybercrime group of Brazilian origin has resurfaced after more than three years to orchestrate a campaign that targets Minecraft players with a new stealer called LofyStealer (aka GrabBot). "The malware disguises itself as a Minecraft hack called 'Slinky,'" Brazil-based cybersecurity company ZenoX said in a technical report. "It uses the official game icon to induce voluntary execution, from The Hacker News https://thehackernews.com/2026/04/brazilian-lofygang-resurfaces-after.html
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The Hacker News - Why Secure Data Movement Is the Zero Trust Bottleneck Nobody Talks About

Every security program is betting on the same assumption: once a system is connected, the problem is solved. Open a ticket, stand up a gateway, push the data through. Done. That assumption is wrong. It is also a major reason Zero Trust programs stall. New research my team just published puts numbers on it. The Cyber360: Defending the Digital Battlespace report, based on a survey of 500 security from The Hacker News https://thehackernews.com/2026/04/why-secure-data-movement-is-zero-trust.html
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The Hacker News - Critical Unpatched Flaw Leaves Hugging Face LeRobot Open to Unauthenticated RCE

Cybersecurity researchers have disclosed details of a critical security flaw impacting LeRobot, Hugging Face's open-source robotics platform with nearly 24,000 GitHub stars, that could be exploited to achieve remote code execution. The vulnerability in question is CVE-2026-25874 (CVSS score: 9.3), which has been described as a case of untrusted data deserialization stemming from the use of the from The Hacker News https://thehackernews.com/2026/04/critical-cve-2026-25874-leaves-hugging.html
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Schneier - What Anthropic’s Mythos Means for the Future of Cybersecurity

Two weeks ago, Anthropic announced that its new model, Claude Mythos Preview, can autonomously find and weaponize software vulnerabilities, turning them into working exploits without expert guidance. These were vulnerabilities in key software like operating systems and internet infrastructure that thousands of software developers working on those systems failed to find. This capability will have major security implications, compromising the devices and services we use every day. As a result, Anthropic is not releasing the model to the general public, but instead to a limited number of companies. The news rocked the internet security community. There were few details in Anthropic’s announcement, angering many observers. Some speculate that Anthropic doesn’t have the GPUs to run the thing, and that cybersecurity was the excuse to limit its release. Others argue Anthropic is holding to its AI safety mission. There’s hype and counter hype , reality and marketing. It’s a lot to so...
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The Hacker News - After Mythos: New Playbooks For a Zero-Window Era

When patching isn’t fast enough, NDR helps contain the next era of threats. If you’ve been tracking advancements in AI, you know the exploit window, the short buffer that organizations relied on to patch and protect after a vulnerability disclosure, is closing fast. Anthropic’s new model, Claude Mythos, and its Project Glasswing, showed that finding exploitable vulnerabilities and subtle cracks from The Hacker News https://thehackernews.com/2026/04/after-mythos-new-playbooks-for-zero.html
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