CVE-2025-54135: cursor Command Injection — Fix

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.

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CVSS v3.1 Score

8.5

HIGH

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

Weakness Type (CWE)

CWE-78 OS Command Injection

CWE-829 CWE-829

Affected Products

Vendor	Product	Versions
anysphere	cursor	< 1.3.9

References

Advisories & Patches

https://github.com/cursor/cursor/security/advisories/GHSA-4cxx-hrm3-49rm

Frequently Asked Questions

What is CVE-2025-54135? +

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. It has a CVSS v3.1 base score of 8.5 (HIGH).

How severe is CVE-2025-54135? +

CVE-2025-54135 has a CVSS v3.1 score of 8.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-54135? +

CVE-2025-54135 affects products from anysphere, specifically: cursor. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-54135? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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