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CVE-2025-62800

FastMCP vulnerable to reflected XSS in client's callback page

FastMCP is the standard framework for building MCP applications. 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 HTML, allowing arbitrary JavaScript execution in the callback server origin. The issue is fixed in version 2.13.0.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Fastmcp Jlowin
Products
Fastmcp Fastmcp
CVE-2025-62801

FastMCP vulnerable to windows command injection in FastMCP Cursor installer via server_name

FastMCP is the standard framework for building MCP applications. Versions prior to 2.13.0, 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. This vulnerability is fixed in 2.13.0.

CVSS 4.0 · 5.4 Medium EPSS < 1% KEV · Not listed
Vendors
Fastmcp Jlowin
Products
Fastmcp Fastmcp