CVE-2025-61591

Cursor CLI's Cursor Agent MCP OAuth2 Communication is Vulnerable to Remote Code Execution

State: Published
Severity: 8.8 High
Published: Oct 3, 2025
Updated: Oct 3, 2025
Reserved: Sep 26, 2025

Description

Cursor is a code editor built for programming with AI. In versions 1.7 and below, when MCP uses OAuth authentication with an untrusted MCP server, an attacker can impersonate a malicious MCP server and return crafted, maliciously injected commands during the interaction process, leading to command injection and potential remote code execution. If chained with an untrusted MCP service via OAuth, this command injection vulnerability could allow arbitrary code execution on the host by the agent. This can then be used to directly compromise the system by executing malicious commands with full user privileges. This issue does not currently have a fixed release version, but there is a patch, 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	<= 1.7Affected

References

https://github.com/cursor/cursor/security/advisories/GHSA-wj33-264c-j9cq

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