Anthropic's Claude Opus 4.6 Discovers 22 Firefox Vulnerabilities Including 14 High-Severity Flaws

Summary

Anthropic's Claude Opus 4.6 model was used to identify 22 previously unknown vulnerabilities in Mozilla Firefox, 14 of which were classified as high severity. The findings were disclosed to Mozilla and have been patched in Firefox 148. This represents one of the most significant demonstrations to date of AI-driven automated vulnerability discovery in production-grade open-source software. The results underscore the rapidly maturing capability of large language models in security-critical code a