271 Security Vulnerabilities Found in Firefox by Anthropic's Claude Mythos, Fixes Completed This Week

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On April 22, Mozilla recently disclosed that Anthropic’s latest AI model, Claude Mythos, identified 271 security vulnerabilities during internal testing of the Firefox browser, with fixes completed this week. In comparison, a previous version of the Anthropic model only found 22 security-sensitive vulnerabilities. Mozilla stated that all discovered vulnerabilities were within the scope of findings by top human researchers. Claude Mythos, officially released in March 2026, is Anthropic’s most powerful model in reasoning, coding, and cybersecurity, currently made available to vetted partners such as Amazon, Apple, and Microsoft through the ‘Project Glasswing’ initiative.

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