| Package | Affected versions | Patched versions |
|---|---|---|
| workers-oauth-provider | = 0.0.5 | |
| @cloudflare/workers-oauth-provider | < 0.0.5 | 0.0.5 |
PKCE was implemented in the OAuth implementation in workers-oauth-provider that is part of MCP framework. However, it was found that an attacker could cause the check to be skipped.
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.
Fixed in: https://github.com/cloudflare/workers-oauth-provider/pull/27
We patched up the vulnerabilities in the latest version, v 0.0.5 of the Workers OAuth provider (https://www.npmjs.com/package/@cloudflare/workers-oauth-provider). You'll need to update your MCP servers to use that version to resolve the vulnerability.
None
Running one of these products? Scan your site to see whether it exposes a vulnerable version.
Scan my site free