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Tool Directory

CVE-2025-54135

CriticalPublished

Cursor Agent is vulnerable to prompt injection via MCP Special Files

Published: Aug 5, 2025
Updated: Aug 5, 2025
Assigning CNA: GitHub_M
Evidence observed: Aug 8, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

1.8%

Low · next 30 days

Percentile: 77.3%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2025-54135Exploit
Exploit for CVE-2025-54135 in Cursor IDE, demonstrating prompt injection via MCP to achieve remote code execution by rewriting mcp.json.
test-mcpPoC
A repo for CVE-2025-54135 reproduction

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