Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

CVE-2025-4144

Gravedad CVSS v4.0:
MEDIA
Tipo:
CWE-287 Autenticación incorrecta
Fecha de publicación:
01/05/2025
Última modificación:
01/05/2025

Descripción

*** Pendiente de traducción *** PKCE was implemented in the OAuth implementation in workers-oauth-provider that is part of MCP framework https://github.com/cloudflare/workers-mcp . However, it was found that an attacker could cause the check to be skipped.<br /> <br /> <br /> Fixed in:<br /> <br /> <br /> <br /> https://github.com/cloudflare/workers-oauth-provider/pull/27 https://github.com/cloudflare/workers-oauth-provider/pull/27 <br /> <br /> <br /> Impact: <br /> <br /> PKCE is a defense-in-depth mechanism against certain kinds of attacks and was an optional extension in OAuth 2.0 which became required in the OAuth 2.1 draft. (Note that the MCP specification requires OAuth 2.1.). This bug completely bypasses PKCE protection.

Referencias a soluciones, herramientas e información