PACKAGIST · AUGUST 2026 · EARLY WARNING

Craft CMS Passkey Login Vulnerability: Replayed WebAuthn Assertions

EARLY WARNING · UNCONFIRMED. This page describes a developing threat that 0Day surfaced from early signals and has not yet independently confirmed. Details may change. Always verify against the primary sources before acting.

GHSA-WG23-69C2-GJC8Severity: HIGH

An early warning has been issued regarding a potential vulnerability in Craft CMS where passkey logins may accept replayed WebAuthn assertions. This issue reportedly affects versions 5.10.3 and the current `5.x` HEAD.

What happened

According to the GitHub Advisory Database, Craft CMS versions 5.10.3 and the current `5.x` HEAD do not persist the updated credential counter, which allows a captured login request to be replayed. This vulnerability, tracked as GHSA-WG23-69C2-GJC8, is under investigation. It is recommended to upgrade to a version of Craft CMS that properly persists the credential counter or apply a patch if available. For more detailed information, consult the primary sources.

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