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 correctly identifies users who require additional verification and defers full authentication until the second factor is completed.
However, when session.cookieCache is enabled, the session generated during the initial sign-in step may be cached as valid prior to 2FA verification. Subsequent session lookups may then return this cached session without re-evaluating the 2FA requirement.
This results in a situation where session validity can be established before all authentication constraints are satisfied.
Impact
An attacker (or user) with valid primary credentials may gain access to protected application routes without completing the required second authentication factor.
Any application using better-auth with both two-factor authentication and session cookie caching enabled may be affected.
Mitigation
- Upgrade to a version of
better-auththat includes the fix for this issue. - Ensure that session caching does not treat sessions as fully authenticated until all required authentication steps, including 2FA, are completed.
- As a temporary workaround, disable
session.cookieCachewhen using two-factor authentication.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de npm | better-auth | < 1.4.9 | 1.4.9 |
Referencias
- Vector CVSS
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N- Debilidad (CWE)
CWE-288- Plataforma
- npm
- Paquete
better-auth- Publicada
- 03.04.2026
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-xg6x-h9c9-2m83 - CC BY 4.0
Historial de vulnerabilidades: better-auth
Todas las vulnerabilidades publicadas de este paquete (Paquete de npm), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 22
- Primera → última
- 12.2024 07.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 2
- Alta 14
- Media 3
- Baja 3
Divulgaciones por año
- 2024: 1
- 2025: 8
- 2026: 13
-
Better Auth Has Two-Factor Authentication Bypass via Premature Session Caching (session.cookieCache) esta entrada
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