CVE-2025-54135
Cursor Agent is vulnerable to prompt injection via MCP Special Files
CRITICAL 9.8EPSS 1.8%
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
- cursor
- CVSS v3.1 NVD
- 9.8 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS v3.1 GITHUB
- 8.5 HIGH
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H - EPSS
- 1.81% chance of exploitation in the next 30 days, 78th percentile
- Published
- 2025-08-05
Proof-of-concept exploits (2)
- anntsmart/CVE-2025-541350★ · 2025-08-02
- hn1e13/test-mcp0★ · 2025-08-07