How severe is CVE-2025-4144?

This vulnerability has a severity rating of MEDIUM with a CVSS score of 9.8 out of 10.

What type of vulnerability is CVE-2025-4144?

This is classified as CWE-287, which is a common weakness in software security.

CVE-2025-4144 - MEDIUM Severity | CVSS 9.8

Vulnerability Description

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.

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