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Firefox finds a slew of new bugs with Claude's help
Anthropic's AI model Claude Opus 4.6 identified 22 vulnerabilities in Firefox, including 14 high-severity bugs, most fixed in the February Firefox 148 release.
- On March 6, 2026, Anthropic disclosed it discovered 22 Firefox vulnerabilities, including 14 high-severity flaws, after approaching Mozilla several weeks earlier.
- Anthropic began work several weeks ago when it approached Firefox's team to run Claude Opus 4.6 over two weeks, starting in the JavaScript engine and expanding across the codebase.
- Using Claude Opus 4.6, Anthropic's team spent $4,000 in API credits crafting proof-of-concept exploits and found Claude was better at spotting vulnerabilities than writing exploits.
- Most fixes appeared in Firefox 148 released this February, with a few waiting for the next Firefox release, and engineers began landing fixes within hours.
- The episode positions AI as both a useful tool and a potential risk, with researchers warning that safeguards are needed if models narrow the exploitation gap, and Anthropic acknowledged it may not last long.
27 Articles
27 Articles
Claude AI discovered 22 Firefox flaws. Here's how many it figured out how to exploit.
Claude AI discovered nearly two dozen vulnerabilities in Firefox, the Mozilla web browser. Anthropic teamed up with Mozilla to test the security of its browser, allowing its AI tool to probe for vulnerabilities. Read, in part, a blog post from Anthropic:"Claude Opus 4.6 discovered 22 vulnerabilities over the course of two weeks. Of these, Mozilla assigned 14 as high-severity vulnerabilities—almost a fifth of all high-severity Firefox vulnerabili…
Anthropic says it found a heap of Firefox security flaws using new Claude tools, says 'AI is making it possible to detect severe security vulnerabilities at highly accelerated speeds'
Claude finds 14 high-severity Firefox bugs in just a few weeks, rivaling what Mozilla could do in months.
Mozilla says Claude AI uncovered over 100 Firefox bugs in just two weeks, including 14 high-severity flaws
Mozilla is now working with Anthropic's Frontier Red Team to identify and patch potentially dangerous security vulnerabilities in Firefox. According to Mozilla, the AI company approached them a few weeks ago with results from a newly developed, AI-assisted bug-hunting method. The approach appears to work, Mozilla said, and could ultimately...Read Entire Article
Mozilla confirmed a strategic collaboration with Anthropic that enabled the identification and correction of tens of vulnerabilities in Firefox. The IA company used Claude to detect 14 critical errors in...
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