Claude AI Found 22 Firefox Vulnerabilities in Two Weeks

What Happened In February 2026, Anthropic conducted an intensive security audit of Mozilla Firefox using their Claude Opus 4.6 AI model. Over the span of just two weeks, the AI system identified 22 security-sensitive vulnerabilities, with 14 classified as high-severity issues requiring immediate attention. Mozilla subsequently issued 22 CVEs (Common Vulnerabilities and Exposures) for these security bugs. The audit wasn’t limited to security issues. Claude also discovered an additional 90 other bugs throughout Firefox’s codebase, demonstrating the AI’s broad capability to identify various types of software defects.