CVE-2025-62801 - FastMCP vulnerable to windows command injection in FastMCP Cursor installer via server_name

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MEDIUM

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

Published Oct 28, 2025

5.4

MEDIUM

CVSS 4.0

EPSS 0.23%

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.

Affected products

Vendor Jlowin Product Fastmcp Default
n/a
- Version
  < 2.13.0
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Jlowin

Fastmcp

n/a

Version	Status	Constraints
< 2.13.0	affected	-

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-78

OS Command Injection

References (4)

https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-36567
Advisory
https://github.com/advisories/GHSA-rj5c-58rq-j5g5
Advisory
https://github.com/jlowin/fastmcp/security/advisories/GHSA-rj5c-58rq-j5g5
exploitx_refsource_CONFIRMThird Party Advisory
https://nvd.nist.gov/vuln/detail/CVE-2025-62801

Link	Providers	Tags
https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-36567		Advisory
https://github.com/advisories/GHSA-rj5c-58rq-j5g5		Advisory
https://github.com/jlowin/fastmcp/security/advisories/GHSA-rj5c-58rq-j5g5		exploitx_refsource_CONFIRMThird Party Advisory
https://nvd.nist.gov/vuln/detail/CVE-2025-62801