CVE-2025-64109

Cursor CLI Beta: Command Injection via Untrusted MCP Configuration

State: Published
Severity: 8.8 High
Published: Nov 4, 2025
Updated: Nov 7, 2025
Reserved: Oct 27, 2025

Description

Cursor is a code editor built for programming with AI. In versions and below, a vulnerability in the Cursor CLI Beta allowed an attacker to achieve remote code execution through the MCP (Model Context Protocol) server mechanism by uploading a malicious MCP configuration in .cursor/mcp.json file in a GitHub repository. Once a victim clones the project and opens it using Cursor CLI, the command to run the malicious MCP server is immediately executed without any warning, leading to potential code execution as soon as the command runs. This issue is fixed in version 2025.09.17-25b418f.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	GitHub_M

Weaknesses

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

Affected Products

Product	Versions
cursorcursor	< 2025.09.17-25b418fAffected

References

https://github.com/cursor/cursor/security/advisories/GHSA-4hwr-97q3-37w2

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