Critical Flaws in Microsoft's Passkey Implementation Uncovered
In July 2026, security researchers identified critical vulnerabilities in Microsoft's passkey implementation within Windows 11 and Microsoft Entra ID. These flaws allowed attackers to exploit weaknesses reminiscent of traditional password attacks, enabling them to impersonate privileged users and bypass phishing-resistant multifactor authentication. The vulnerabilities were disclosed to Microsoft, which subsequently released patches to address the issues. This incident underscores the importance of thorough implementation and validation of security protocols, even when adopting advanced authentication methods like passkeys. Organizations must remain vigilant, ensuring that new technologies are deployed securely to prevent exploitation by threat actors.
Kill Chain
