Better Auth Has Two-Factor Authentication Bypass via Premature Session Caching (session.cookieCache)

Summary Under certain configurations, sessions may be considered valid before two-factor authentication 2FA is fully completed. This can allow access to authenticated routes without verifying the second factor. --- Description When two-factor authentication is enabled, the authentication flow...

PT-2026-67317

Name of the Vulnerable Software and Affected Versions better-auth versions prior to 1.4.9 Description A two-factor authentication 2FA bypass occurs when session.cookieCache is enabled. The issue arises because the session generated during the initial sign-in step may be cached as valid before the...