Krux
March 10, 2026
Claude Found 22 Firefox Bugs in Two Weeks
Published: March 10, 2026 at 12:31 AM
Updated: March 10, 2026 at 12:31 AM
100-word summary
Anthropic's new Claude Opus 4.6 discovered 22 Firefox vulnerabilities in a two-week Mozilla security collaboration, with 14 rated high-severity. The updated model now handles 1-million-token context windows and ships with Claude Code Security, which can autonomously spot flaws, generate patches, and file GitHub pull requests. It's rolling out across the Claude API, GitHub Copilot tiers, and Microsoft Azure. When researchers let Claude attempt exploits in controlled tests, it succeeded only a handful of times out of hundreds of tries. Still, the Firefox haul suggests AI could soon be a standard part of bug-hunting workflows, not just a glorified code formatter.
What happened
Anthropic's new Claude Opus 4.6 discovered 22 Firefox vulnerabilities in a two-week Mozilla security collaboration, with 14 rated high-severity. The updated model now handles 1-million-token context windows and ships with Claude Code Security, which can autonomously spot flaws, generate patches, and file GitHub pull requests. It's rolling out across the Claude API, GitHub Copilot tiers, and Microsoft Azure. When researchers let Claude attempt exploits in controlled tests, it succeeded only a handful of times out of hundreds of tries.
Why it matters
Still, the Firefox haul suggests AI could soon be a standard part of bug-hunting workflows, not just a glorified code formatter.