CVE-2026-59723
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk15th percentile - higher than 15% of all known CVEs
Summary
A vulnerability in Cline Hub dashboard server before version 3.0.30 allows an attacker to send desktopCommand frames via WebSocket without Origin header validation. When ROOM_SECRET is unset for local 127.0.0.1 binds, the isAuthorizedBrowserRequest() function enables attacker-controlled websites to read workspace state, mutate MCP and provider settings, and trigger command execution.
Risk Assessment
The risk involves potential remote compromise of the Cline coding agent by an attacker, leading to data theft, configuration modification, and unauthorized command execution in the development environment.
Recommendation
Immediately update Cline to version 3.0.30 or later. For local environments, set the ROOM_SECRET variable and implement Origin header validation on the WebSocket server.
Other vulnerabilities in Cline
Original NVD description (English source)
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.