Incorrect Check of Function Return Value

Overview Affected versions of this package are vulnerable to Incorrect Check of Function Return Value in the "second factor" flow where FinishAssertionSteps fails to cross-check the verified credential handle against the requested username when a userHandle is not found for that username during t...

PT-2026-40845

Yubico webauthn-server-core aka java-webauthn-server 2.8.0 before 2.8.2 incorrectly checks a function's return value in the second factor flow, leading to impersonation...

YSA-2026-02 | Yubico

A security update is available for the Yubico open-source software project webauthn-server-core to resolve a user impersonation vulnerability. No Yubico hardware is affected. In specific implementations, an attacker that has an existing account with a relying party RP can authenticate as a target...