Passkey UV Flag Bypass Reduces Passwordless Auth to Single Factor

Mon, 03 Aug 2026 13:48:19 +0000

Engineer — Plan: Audit your WebAuthn/passkey relying party implementation to confirm the User Verified flag is enforced; if your app accepts assertions without UV=true, you’ve silently degraded MFA to single-factor auth.
SOC/IR — Learn: No exploitation in the wild reported and no IOCs available; useful for understanding how passkey bypass could appear in authentication logs if UV flag checks are absent.
Leader — Skip

Webauthn on CuraSec