Vulnerability Description
Cline is an autonomous coding agent as an SDK, IDE extension, or CLI assistant. Prior to 3.0.30, the Cline Hub dashboard server launched by the cline dashboard command accepts WebSocket connections on the /browser endpoint without validating the Origin header, and when ROOM_SECRET is unset for local 127.0.0.1 binds, isAuthorizedBrowserRequest() allows attacker-controlled websites to send desktopCommand frames that read workspace state, mutate MCP and provider settings, and trigger command execution when a provider or model is configured. This issue is fixed in version 3.0.30.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/cline/cline/commit/d09270940f5746f288cfc4a5039b46a2f4d5d01e
- https://github.com/cline/cline/pull/11724
- https://github.com/cline/cline/releases/tag/cli-v3.0.30
- https://github.com/cline/cline/security/advisories/GHSA-3cj3-hqcr-g934
- https://github.com/cline/cline/security/advisories/GHSA-3cj3-hqcr-g934
FAQ
What is CVE-2026-59723?
CVE-2026-59723 is a vulnerability with a CVSS score of 8.8 (HIGH). Cline is an autonomous coding agent as an SDK, IDE extension, or CLI assistant. Prior to 3.0.30, the Cline Hub dashboard server launched by the cline dashboard command accepts WebSocket connections on...
How severe is CVE-2026-59723?
CVE-2026-59723 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-59723?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.