CVE-2025-62801

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

CVSS 5.4 MEDIUMEPSS 0.2%CWE-78

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 5.4EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

28 Oct 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Affected products

jlowin · fastmcp

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References

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