CVE-2025-62801

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

State: Published
Severity: 5.4 Medium
Published: Oct 28, 2025
Updated: Oct 29, 2025
Reserved: Oct 22, 2025

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	5.4 Medium	CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Affected Products

Product	Versions
fastmcpjlowin	< 2.13.0Affected

References

https://github.com/jlowin/fastmcp/security/advisories/GHSA-rj5c-58rq-j5g5

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.