CVE-2025-69196

Medium

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.

SeverityMedium

CVSS6.5

Exploit probability—

ProductJlowin Fastmcp

PublishedMar 16, 2026

First seenMar 16, 2026

Weakness typeCWE-863Incorrect authorization

How to fix

Update

jlowin fastmcp2.14.2 or later
fastmcp2.14.2 or later

Vendor advisories

access.redhat.com/errata/RHSA-2026:36350

Affected products

Product	Affected versions	Fixed in
jlowin fastmcp	v < 2.14.2	2.14.2
fastmcpPyPI	v < 2.14.2	2.14.2

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