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Cursor <= 1.2.1 RCE (GHSA-4cxx-hrm3-49rm)

high Nessus Plugin ID 243971

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Synopsis

The Cursor instance installed on the remote host is affected a remote code execution vulnerability.

Description

The version of Cursor installed on the remote host is 1.2.1 or prior. It is, therefore, affected by a remote code execution vulnerability. An attacker could achieve remote and persistent code execution by modifying an already trusted MCP configuration file inside a shared GitHub repository or editing the file locally on the target's machine. Once a collaborator accepts a harmless MCP, the attacker could silently swap it for a malicious command (e.g., calc.exe) without triggering any warning or re-prompt.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade Cursor to version 1.3.9 or later.

See Also

http://www.nessus.org/u?41cf65ea

Plugin Details

Severity: High

ID: 243971

File Name: cursor_GHSA-4cxx-hrm3-49rm.nasl

Version: 1.2

Type: local

Agent: windows, macosx, unix

Published: 8/6/2025

Updated: 8/7/2025

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.9

CVSS v2

Risk Factor: High

Base Score: 7.1

Vector: CVSS2#AV:N/AC:H/Au:S/C:C/I:C/A:C

CVSS Score Source: CVE-2025-54135

CVSS v3

Risk Factor: High

Base Score: 8.5

Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Vulnerability Information

CPE: x-cpe:/a:anysphere:cursor

Required KB Items: installed_sw/Anysphere Cursor

Patch Publication Date: 8/1/2025

Vulnerability Publication Date: 8/2/2025

Reference Information

CVE: CVE-2025-54135