# CVE-2025-54135: Cursor Agent is vulnerable to prompt injection via MCP Special Files

> CVE-2025-54135: Cursor Agent is vulnerable to prompt injection via MCP Special Files. CVSS 8.6 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2025-54135
Last updated: 2026-06-17T09:39:30Z

- Published: 2025-08-05 00:11 UTC · Updated: 2026-06-17 09:39 UTC · Assigner: GitHub\_M
- CVSS: 8.6 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
- EPSS: 2.1%, 81th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-78, CWE-829

## Description

Cursor is a code editor built for programming with AI. Cursor allows writing in-workspace files with no user approval in versions below 1.3.9, If the file is a dotfile, editing it requires approval but creating a new one doesn't. Hence, if sensitive MCP files, such as the .cursor/mcp.json file don't already exist in the workspace, an attacker can chain a indirect prompt injection vulnerability to hijack the context to write to the settings file and trigger RCE on the victim without user approval. This is fixed in version 1.3.9.

## 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-2025-54135)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-54135)
- [https://github.com/cursor/cursor/security/advisories/GHSA-4cxx-hrm3-49rm](https://github.com/cursor/cursor/security/advisories/GHSA-4cxx-hrm3-49rm)

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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-2025-54135 · Markdown: https://rewindex.com/cve/CVE-2025-54135.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-54135 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:16:26.326Z