CVE-2025-62801: fastmcp Command Injection — Exploit

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.

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-78 OS Command Injection

Affected Products

Vendor	Product	Versions
jlowin	fastmcp	< 2.13.0

References

Exploits

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

Frequently Asked Questions

What is CVE-2025-62801? +

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. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-62801? +

CVE-2025-62801 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-62801? +

CVE-2025-62801 affects products from jlowin, specifically: fastmcp. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-62801? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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