CVE-2025-64109: Cursor CLI Beta: Command Injection via Untrusted MCP Configuration

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-11-05 · updated 2026-10-19
Weakness: CWE-78

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.

Affected products

cursor: before 2025.09.17-25b418f

References

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

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