CVE-2025-61591 Cursor CLI's Cursor Agent MCP OAuth2 Communication is Vulnerable to Remote Code Execution
Attackers can execute arbitrary code on the host by impersonating a malicious MCP server during OAuth authentication in Cursor CLI.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-61591?
CVE-2025-61591 is a high-severity command injection vulnerability in cursor, published on 3 Oct 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Cursor is a code editor built for programming with AI. In versions 1.7 and below, when MCP uses OAuth authentication with an untrusted MCP server, an attacker can impersonate a malicious MCP server and return crafted, maliciously injected commands during the interaction process, leading to command injection and potential remote code execution. If chained with an untrusted MCP service via OAuth, this command injection vulnerability could allow arbitrary code execution on the host by the agent. This can then be used to directly compromise the system by executing malicious commands with full user privileges. This issue does not currently have a fixed release version, but there is a patch, 2025.09.17-25b418f.
Weakness: CWE-78
Which versions are affected by CVE-2025-61591?
It affects 1 product.
Products include Anysphere Cursor.
How do I fix CVE-2025-61591?
No fix has been published for CVE-2025-61591 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2025-61591 being exploited?
There is no known exploitation of CVE-2025-61591 in the wild and no public exploit code.
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