Claude Mythos Finds 271 Firefox Vulnerabilities
infonewsLLM-Specific
securityresearch
Source: SecurityWeekApril 22, 2026
Summary
A tool called Claude Mythos discovered 271 security vulnerabilities (weak points that could be exploited) in Firefox, Mozilla's web browser. According to Mozilla, all of these flaws could have also been found by a highly skilled human security researcher, suggesting the AI tool didn't discover anything that experienced humans couldn't find.
Classification
Attack SophisticationModerate
Impact (CIA+S)
integrity
Affected Vendors
Anthropic
Related Issues
Monthly digest — independent AI security research
Original source: https://www.securityweek.com/claude-mythos-finds-271-firefox-vulnerabilities/
First tracked: April 22, 2026 at 08:00 AM
Classified by LLM (prompt v3) · confidence: 75%