# CVE-2025-54136: Cursor's Modification of MCP Server Definitions Bypasses Manual Re-approvals

> CVE-2025-54136: Cursor's Modification of MCP Server Definitions Bypasses Manual Re-approvals. CVSS 7.2 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2025-54136
Last updated: 2026-06-17T09:39:30Z

- Published: 2025-08-01 23:08 UTC · Updated: 2026-06-17 09:39 UTC · Assigner: GitHub\_M
- CVSS: 7.2 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- EPSS: 28.5%, 98th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-78

## Description

Cursor is a code editor built for programming with AI. In versions 1.2.4 and below, attackers can 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 can silently swap it for a malicious command (e.g., calc.exe) without triggering any warning or re-prompt. If an attacker has write permissions on a user's active branches of a source repository that contains existing MCP servers the user has previously approved, or allows an attacker has arbitrary file-write locally, the attacker can achieve arbitrary code execution. This is fixed in version 1.3.

## Affected vendors and products

- cursor: cursor

## Tracked companies

- [Cursor](https://rewindex.com/company/cursor.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-54136)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-54136)
- [https://github.com/cursor/cursor/security/advisories/GHSA-24mc-g4xr-4395](https://github.com/cursor/cursor/security/advisories/GHSA-24mc-g4xr-4395)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2025-54136 · Markdown: https://rewindex.com/cve/CVE-2025-54136.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-54136 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:09:10.267Z