CVE-2025-61591 — Cursor CLI's Cursor Agent MCP OAuth2 Communication is Vulnerable to Remote Code Execution
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 …
Published: 2025-10-03 · CVSS: 8.8 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7