CVE-2026-59723
HIGHCline: Cross-Origin WebSocket Hijacking in Cline Hub Dashboard (`/browser` endpoint)
Title source: cnaDescription
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.
References (4)
Core 4
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/cline/cline/security/advisories/GHSA-3cj3-hqcr-g934
X_Refsource_Misc x_refsource_misc
https://github.com/cline/cline/pull/11724
X_Refsource_Misc x_refsource_misc
https://github.com/cline/cline/commit/d09270940f5746f288cfc4a5039b46a2f4d5d01e
X_Refsource_Misc x_refsource_misc
https://github.com/cline/cline/releases/tag/cli-v3.0.30
Scores
CVSS v3
8.8
EPSS
0.0014
EPSS Percentile
4.2%
Attack Vector
ADJACENT_NETWORK
CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
total
Details
CWE
CWE-346
Status
published
Products (1)
cline/cline
< 3.0.30
Published
Jul 08, 2026
Tracked Since
Jul 09, 2026