PatchSiren cyber security CVE debrief
CVE-2026-59723 cline CVE debrief
The Cline Hub dashboard server launched by the cline dashboard command accepts WebSocket connections on the /browser endpoint without validating the Origin header. 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. The vulnerability affects Cline autonomous coding agent versions prior to 3.0.30 and has been addressed in the latest version.
- Vendor
- cline
- Product
- Unknown
- CVSS
- HIGH 8.8
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-07-08
- Original CVE updated
- 2026-07-10
- Advisory published
- 2026-07-08
- Advisory updated
- 2026-07-10
Who should care
Users of Cline autonomous coding agent versions prior to 3.0.30 should update to the latest version to prevent potential attacks. This includes operators, administrators, and security teams responsible for managing and securing Cline deployments.
Technical summary
The Cline Hub dashboard server launched by the cline dashboard command accepts WebSocket connections on the /browser endpoint without validating the Origin header. 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 and affects Cline autonomous coding agent versions prior to 3.0.30.
Defensive priority
High
Recommended defensive actions
- Update Cline autonomous coding agent to version 3.0.30 or later
- Restrict WebSocket connections to only trusted origins
- Monitor for suspicious desktopCommand frames
- Implement additional security measures to prevent command execution
- Review compensating controls for exposed systems while remediation is scheduled and verified
- Check relevant monitoring, detection, and logs for exposed assets that need extra review
- Track exceptions, retest remediated assets, and close the item only after evidence is documented
Evidence notes
The CVE record was published on 2026-07-08T23:16:56.440Z and was last modified on 2026-07-10T19:17:58.040Z. The NVD entry is currently Undergoing Analysis. The Cline Hub dashboard server launched by the cline dashboard command accepts WebSocket connections on the /browser endpoint without validating the Origin header. 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.
Official resources
AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-08T23:16:56.440Z and has not been modified since then. The NVD entry is currently Undergoing Analysis.