RCE in Anysphere Cursor
CVE-2025-61591
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.
Vulnerability class: Command Injection (OS Command Injection)
EPSS: 0.011 (62.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Anysphere Cursor
- Cursor — versions <= 1.7
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-61591?
- CVE-2025-61591 is a high-severity vulnerability in Anysphere Cursor, classified under OS Command Injection. CVSS score: 8.8/10. Published 2025-10-03.
- How severe is CVE-2025-61591?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2025-61591 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.