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CVE-2025-62801

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

Published: Oct 28, 2025Updated: Nov 4, 2025 Sources: CVE List NVD GHSACWE-78
NVD MITRE
7.8CVSSHIGH
EPSS Score
0.2%
Top 91.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:LAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-78

Affected Products

fastmcpjlowin
Library
AI / ML / ai-agent-tooling
fastmcpPyPIOSS Libraries
jlowinindividual-devAI / MLaka fastmcp
pypipackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Execution
View detailed technique mapping

References

https://github.com/jlowin/fastmcp/security/advisories/GHSA-rj5c-58rq-j5g5
github.com
https://nvd.nist.gov/vuln/detail/CVE-2025-62801
nvd.nist.gov
https://github.com/jlowin/fastmcp
github.com

Timeline

Published
Oct 28, 2025
Last Updated
Nov 4, 2025

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