CVE-2025-4144

CRITICAL

9.8

Beschreibung

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.

CVE Details

CVSS v3.1 Bewertung9.8

SchweregradCRITICAL

CVSS VektorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

AngriffsvektorNETWORK

KomplexitatLOW

Erforderliche PrivilegienNONE

BenutzerinteraktionNONE

Veroffentlicht5/1/2025

Zuletzt geandert5/12/2025

Quellenvd

Honeypot-Sichtungen0

Betroffene Produkte

cloudflare:workers-oauth-provider

Schwachen (CWE)

CWE-287

Referenzen

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

IOC Korrelationen

Keine Korrelationen erfasst

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