CVE-2025-4144

CRITICAL

9.8

Descricao

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. Fixed in: https://github.com/cloudflare/workers-oauth-provider/pull/27 https://github.com/cloudflare/workers-oauth-provider/pull/27 Impact: 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.

Detalhes CVE

Pontuacao CVSS v3.19.8

SeveridadeCRITICAL

Vetor CVSSCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vetor de ataqueNETWORK

ComplexidadeLOW

Privilegios necessariosNONE

Interacao do usuarioNONE

Publicado5/1/2025

Ultima modificacao5/12/2025

Fontenvd

Avistamentos honeypot0

Produtos afetados

cloudflare:workers-oauth-provider

Fraquezas (CWE)

CWE-287

Referencias

https://github.com/cloudflare/workers-oauth-provider/pull/27(cna@cloudflare.com)

Correlacoes IOC

Sem correlacoes registradas

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