← AI agent vulnerabilities

CVE-2025-69196

FastMCP

6.5
Severity
Medium
Published
March 16, 2026
Last modified
July 15, 2026

FastMCP is the standard framework for building MCP applications. Prior to version 2.14.2, the server does not properly respect the resource parameter submitted by the client in the authorization and token request. Instead of issuing the token explicitly for the MCP server, the token is issued for the base_url passed to the OAuthProxy during initialization. This issue has been patched 2.14.2.

CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Weakness

References

CVE-2025-69196 on NVD

Listed in

MediumMCP serversMissing authorization

More FastMCP CVEs

Apr 3
CVE-2026-271246.1

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…

Apr 3
CVE-2025-643406.7

Server names containing shell metacharacters (e.g., &) can cause command injection on Windows when passed to fastmcp install claude-code or fastmcp install gemini-cli.

Apr 2
CVE-2026-3287110.0

The OpenAPIProvider in FastMCP exposes internal APIs to MCP clients by parsing OpenAPI specifications.

Oct 28
CVE-2025-628017.8

A command-injection vulnerability lets any attacker who can influence the server_name field of an MCP execute arbitrary OS commands on Windows hosts that run fastmcp install cursor.

Oct 28
CVE-2025-628006.1

Versions prior to 2.13.0 have a reflected cross-site scripting vulnerability in the OAuth client callback page (oauth_callback.py) where unescaped user-controlled values are inserted into the generated…