Anthropic’s Claude found 22 vulnerabilities in Firefox over two weeks

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techcrunch.com/2026/03/06/anthropics-claude-fou…

In a recent security partnership with Mozilla, Anthropic found 22 separate vulnerabilities in Firefox — 14 of them classified as “high-severity.”

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If these are anything like the other AI vulnerability reports I would say there’s a tiny chance one of the high severity ones is a minor bug and the others are hot air.

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Notably, Claude Opus was much better at finding vulnerabilities than writing software to exploit them. The team ended up spending $4,000 in API credits trying to concoct proof-of-concept exploits, but only succeeded in two cases.

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