CVE-2026-59723
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,…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.21%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 8.8 HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
- EPSS
- 0.21% probability · 12th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-346
- Affected
- cline/cline
- Source
- security-advisories@github.com
References
- https://github.com/cline/cline/commit/d09270940f5746f288cfc4a5039b46a2f4d5d01ePatch
- https://github.com/cline/cline/pull/11724Issue Tracking, Patch
- https://github.com/cline/cline/releases/tag/cli-v3.0.30Release Notes
- https://github.com/cline/cline/security/advisories/GHSA-3cj3-hqcr-g934Exploit, Vendor Advisory
- https://github.com/cline/cline/security/advisories/GHSA-3cj3-hqcr-g934Exploit, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.