Vulnerabilities CVE-2025-69196

CVE-2025-69196

High

Open

TLP:CLEAR

FastMCP OAuth Proxy token reuse across MCP servers

NVD CVE.org

Critical Infrastructure

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Description

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.

Details

CVSS Score: 7.4
EPSS Score ⓘ: 0.36%

28.6th percentile
CVSS Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Confidence: 90%
Published: Mar 16, 2026
Last Modified: Jul 15, 2026

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