Cline: Cross-Origin WebSocket Hijacking in Cline Hub Dashboard (`/browser` endpoint)

Summary The Cline Hub dashboard server @cline/cline-hub, launched via the cline dashboard CLI command, accepts WebSocket connections on the /browser endpoint without validating the HTTP Origin header. When ROOMSECRET is not set—the default for local 127.0.0.1 binds—isAuthorizedBrowserRequest...

Origin Validation Error

Overview cline is an Autonomous coding agent CLI - capable of creating/editing files, running commands, using the browser, and more Affected versions of this package are vulnerable to Origin Validation Error via missing WebSocket host and origin validation in the cline-hub dashboard server...

CVE-2026-59723

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 ROOMSECRET is unset for loc...

CVE-2026-59723 Cline: Cross-Origin WebSocket Hijacking in Cline Hub Dashboard (`/browser` endpoint)

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 ROOMSECRET is unset for loc...

CVE-2026-59723 Cline: Cross-Origin WebSocket Hijacking in Cline Hub Dashboard (`/browser` endpoint)

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 ROOMSECRET is unset for loc...

CVE-2026-59723

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 ROOMSECRET is unset for loc...

PT-2026-56625

Name of the Vulnerable Software and Affected Versions Cline versions prior to 3.0.30 Description The Cline Hub dashboard server, initiated via the cline dashboard command, fails to validate the Origin header for WebSocket connections on the /browser endpoint. When the ROOM SECRET is unset for loc...