CVE-2026-67337

CVE-2026-67337 affects better-auth versions before 1.4.9. The issue is a two‑factor authentication bypass when session.cookieCache is enabled: attackers with valid primary credentials can reach authenticated routes without completing second‑factor verification by exploiting premature session cach...

EUVD-2026-51837

better-auth versions before 1.4.9 contain a two-factor authentication bypass vulnerability when session.cookieCache is enabled. Attackers with valid primary credentials can access authenticated routes without completing second-factor verification by exploiting premature session caching...

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...