CVE-2025-54136 Cursor's Modification of MCP Server Definitions Bypasses Manual Re-approvals
Attackers can achieve remote code execution by silently modifying trusted MCP server configurations in shared repositories or locally, bypassing security re-approval prompts.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-54136?
CVE-2025-54136 is a high-severity code injection vulnerability in cursor, published on 1 Aug 2025. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Weakness: CWE-78
Which versions are affected by CVE-2025-54136?
It affects 1 product.
Products include Anysphere Cursor.
How do I fix CVE-2025-54136?
No fix has been published for CVE-2025-54136 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2025-54136 being exploited?
There is no known exploitation of CVE-2025-54136 in the wild and no public exploit code.
Public exploit code: 3 proofs of concept on GitHub.
Other vulnerabilities in cursor
- CVE-2026-50548 Cursor Desktop sandbox escape via agent-controlled working directory
- CVE-2026-50549 Cursor Desktop sandbox escape via symlink and failed path canonicalization
- CVE-2025-64106 Cursor: Speedbump Modal Bypass in MCP Server Deep-Link
- CVE-2025-64107 Cursor is Vulnerable to Path Manipulation Using Backslashes on Windows
- CVE-2025-64108 Cursor's Sensitive File Modification can Lead to NTFS Path Quirks