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Vulnerabilities

CVE-2026-27124 | BDVDB-2026-324644 Detail

jlowinfastmcp

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 user's 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.

Impact#

Per CVSS v4.0: confidentiality impact none, integrity impact high, availability impact none. Attack vector: network.

Weaknesses#

  • CWE-441 Unintended Proxy or Intermediary ('Confused Deputy')

References#

Exploit#

No public exploit known

History#

  1. Version 1Record published in the CVE List.