8.7Alta
CVE-2026-67336better-auth before 1.6.11 Insecure Cryptographic Defaults via oidcProvider
Descripción
better-auth versions before 1.6.11 contain insecure cryptographic defaults in the oidcProvider and mcp plugins that advertise the none algorithm and accept plain PKCE by default. Attackers can exploit algorithm negotiation to accept unsigned tokens or intercept authorization codes when PKCE plain is used instead of the required S256 method.
Debilidad (CWE):
CWE-327
Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.
Productos y versiones afectados
| Fabricante | Producto | Versiones | |
|---|---|---|---|
| better-auth | better-auth | < 1.6.11, fixed 1.6.11 | |
| better-auth | better-auth/oauth-provider | < 1.6.11 |
Referencias y parches
- GitHub Security Advisory (GHSA-9h47-pqcx-hjr4) vendor-advisory
- VulnCheck Advisory: better-auth before 1.6.11 Insecure Cryptographic Defaults via oidcProvider third-party-advisory