Security Advisory

CVE-2026-27124

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2026-04-03 15:22:17

Last updated 2026-04-03 16:44:20

Assigner GitHub_M

State PUBLISHED

Description

FastMCP is the standard framework for building MCP applications. Prior to version 3.2.0, while testing the GitHubProvider OAuth integration, which allows authentication to a FastMCP MCP server via a FastMCP OAuthProxy using GitHub OAuth, it was discovered that the FastMCP OAuthProxy does not properly validate the users consent upon receiving the authorization code from GitHub. In combination with GitHub’s behavior of skipping the consent page for previously authorized clients, this introduces a Confused Deputy vulnerability. This issue has been patched in version 3.2.0.

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