Anthropic Discovers 22 Security Vulnerabilities in Mozilla Firefox Using AI

Anthropic identified 22 new security vulnerabilities in Mozilla Firefox using its Claude Opus 4.6 AI model as part of a security partnership with Mozilla. Of these, 14 were classified as high severity, seven as moderate, and one as low severity. The vulnerabilities were addressed in Firefox 148, released in late March 2026. The discovery process took place over a two-week period, though specific dates were not provided. No CVE IDs or detailed technical impacts were disclosed in the report.