The gist: Passkey implementations in Microsoft products exhibit vulnerabilities that enable classic impersonation attacks on privileged users.
Security researchers have discovered exploitable gaps in Microsoft’s passkey implementation that could allow attackers to impersonate privileged users. The findings will be presented at Black Hat USA.
Independent security researchers have identified exploitable gaps in Microsoft’s passkey implementation. These vulnerabilities could potentially enable attackers to impersonate privileged users and gain access to systems or data that require elevated privileges.
The research findings demonstrate that cryptographic authentication mechanisms such as passkeys are not fully immune to established attack patterns when their implementation is flawed. The specific technical details and affected components will be disclosed during the Black Hat USA conference.
For security leaders, this means: even advanced authentication technologies require strict implementation review and validation. A risk reassessment of Microsoft environments, particularly regarding multi-factor and passkey-based authentication, is warranted. Security teams should review, until Microsoft provides patches, whether and how the identified vulnerabilities affect their infrastructure.
Source: www.darkreading.com · Published July 23, 2026
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