CVE-2026-67337 better-auth before 1.4.9 Two-Factor Authentication Bypass via session.cookieCache

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...

CVE-2026-67337 better-auth before 1.4.9 Two-Factor Authentication Bypass via session.cookieCache

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...

Authentication Bypass Using an Alternate Path or Channel

Overview better-auth is a The most comprehensive authentication library for TypeScript. Affected versions of this package are vulnerable to Authentication Bypass Using an Alternate Path or Channel in the session.cookieCache component. An attacker can gain unauthorized access to protected...