Anthropic Finds 22 Firefox Vulnerabilities Using Claude Opus 4.6 AI Model
Summary
Anthropic used Claude Opus 4.6 (a large language model, or LLM, which is an AI trained on vast amounts of text to understand and generate language) to find 22 security vulnerabilities in Firefox, including 14 classified as high-severity. The AI model discovered these bugs by scanning nearly 6,000 C++ files in just two weeks, demonstrating that AI can be effective at identifying security flaws in complex software.
Solution / Mitigation
Most issues have been fixed in Firefox 148, with the remainder to be fixed in upcoming releases. Additionally, Anthropic developed Claude Code Security, which uses an AI agent to automatically generate patches for vulnerabilities; the company uses task verifiers (tools that check if a proposed fix actually works) to gain confidence that patches fix the specific vulnerability while maintaining the program's normal functionality.
Classification
Affected Vendors
Related Issues
Original source: https://thehackernews.com/2026/03/anthropic-finds-22-firefox.html
First tracked: March 7, 2026 at 03:00 PM
Classified by LLM (prompt v3) · confidence: 92%