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.
History

Mon, 16 Mar 2026 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 16 Mar 2026 18:45:00 +0000

Type Values Removed Values Added
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.
Title FastMCP OAuth Proxy token reuse across MCP servers
Weaknesses CWE-863
References
Metrics cvssV4_0

{'score': 7.4, '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-16T19:09:43.436Z

Reserved: 2025-12-29T14:34:16.261Z

Link: CVE-2025-69196

cve-icon Vulnrichment

Updated: 2026-03-16T19:09:36.408Z

cve-icon NVD

Status : Received

Published: 2026-03-16T19:16:14.397

Modified: 2026-03-16T19:16:14.397

Link: CVE-2025-69196

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.