Claude Mythos Identifies 271 Firefox 150 Vulnerabilities, Mozilla Sees Opportunity for Defenders
Summary
Mozilla says Claude Mythos identified 271 vulnerabilities in Firefox 150; an earlier Opus 4.6 scan led to 22 fixes in Firefox 148. Anthropic limits Mythos access through Project Glasswing amid misuse concerns and reports of unauthorized access.
Key points
- Mozilla says Claude Mythos identified 271 vulnerabilities in Firefox 150.
- An earlier scan using Claude Opus 4.6 led to fixes for 22 security-sensitive bugs in Firefox 148.
- Mozilla CTO Bobby Holley said models can match elite human researchers at finding complex vulnerabilities and argued defenders can benefit.
- Anthropic does not plan to release Mythos publicly, citing the risk of misuse to find zero-days and develop exploits.
- Project Glasswing gives selected technology, cybersecurity, and financial organizations early access to Mythos.
- Bloomberg reportedly said a handful of users in a private online forum gained unauthorized access to Mythos on the day Anthropic announced limited testing access.
Article Details
- Event Type
- AI-assisted vulnerability discovery and security research
- Impact
- Mozilla reported that Claude Mythos identified 271 vulnerabilities in Firefox 150. Earlier Opus 4.6 scans led to fixes for 22 security-sensitive bugs in Firefox 148. Anthropic is limiting access to Mythos through Project Glasswing, citing misuse concerns; Bloomberg reported that a handful of users in a private online forum gained unauthorized access to the model on the day limited testing access was announced.
People
Vendors
AnthropicMozilla tested Anthropic’s Claude Mythos and found the model could identify hundreds of vulnerabilities, with Mythos flagging 271 issues in Firefox 150 after Mozilla’s earlier Opus 4.6 scan led to fixes for 22MozillaMozilla tested Anthropic’s Claude Mythos and found the model could identify hundreds of vulnerabilities, with Mythos flagging 271 issues in Firefox 150 after Mozilla’s earlier Opus 4.6 scan led to fixes for 22
Products
Claude MythosMozilla tested Anthropic’s Claude Mythos and found the model could identify hundreds of vulnerabilities, with Mythos flagging 271 issues in Firefox 150 after Mozilla’s earlier Opus 4.6 scan led to fixes for 22Mozilla Firefoxand found the model could identify hundreds of vulnerabilities, with Mythos flagging 271 issues in Firefox 150 after Mozilla’s earlier Opus 4.6 scan led to fixes for 22 security-sensitive bugs in Firefox 148.Opus 4.6hundreds of vulnerabilities, with Mythos flagging 271 issues in Firefox 150 after Mozilla’s earlier Opus 4.6 scan led to fixes for 22 security-sensitive bugs in Firefox 148.
Industries
CybersecurityThe Mozilla Foundation tested Claude Mythos, an Anthropic AI model that has stirred debate in the cybersecurity community.TechnologyInstead, it launched Project Glasswing, a selective program that gives major technology, cybersecurity, and financial organizations early access to the model.