CVE-2026-27124

A flaw was found in FastMCP and FastMCP OAuthProxy. The OAuthProxy, used for GitHub OAuth authentication, does not properly validate a user's consent after receiving an authorization code from GitHub. This, combined with GitHub's behavior of skipping the consent page for previously authorized...

PT-2026-29421

Name of the Vulnerable Software and Affected Versions: FastMCP versions prior to 3.2.0 Description: FastMCP is susceptible to a Confused Deputy issue within its GitHubProvider OAuth integration. The OAuthProxy component fails to properly validate user consent when receiving authorization codes fr...