Firefox Flaws by AI, Edge Bolsters Passkey Sync Security

Mozilla Firefox Vulnerabilities Discovered by Anthropic's Claude Mythos AI

• Mozilla confirmed that Anthropic's Claude Mythos AI model identified several vulnerabilities in the Firefox browser, signaling a new era of AI-assisted security research.
• The AI's findings highlight its advanced capability to uncover complex security flaws, including potential memory safety issues, within extensive web browser codebases.
• This collaboration between human researchers and AI in detecting Firefox vulnerabilities promises to significantly enhance proactive browser security and detection methodologies.

Source: Security.nl | Date: April 24, 2026

Microsoft Enhances Passkey Synchronization Security in Edge Password Manager

• Microsoft is enhancing the security of passkey synchronization within its Password Manager, integrated with Microsoft Edge, to provide robust, phishing-resistant authentication.
• The implementation focuses on end-to-end encryption for passkeys, ensuring sensitive credential data remains protected across devices and leveraging the WebAuthn standard.
• This initiative aims to streamline user experience for passwordless authentication while maintaining high security standards against common web-based attacks like phishing.

Source: Microsoft Edge Dev Blog | Date: April 22, 2026

References

1. Mozilla: Firefox kwetsbaarheden door Claude Mythos van Anthropic ontdekt - Security.nl
2. Engineering secure passkey sync in Microsoft Password Manager - Microsoft Edge Dev Blog