CVE-2026-44211

Cline Kanban Server has a Cross-Origin WebSocket Hijacking Vulnerability

State: Published
Severity: 9.6 Critical
Published: Jun 1, 2026
Updated: Jun 4, 2026
Reserved: May 5, 2026

Description

Cline is an autonomous coding agent as an SDK, IDE extension, or CLI assistant. In versions 2.13.0 and prior, there is a cross-origin WebSocket hijack vulnerability in Cline Kanban servers. At time of publication, there are no publicly available patches.

Scores

CVSS	Score	Vector	Source
3.1	9.6 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H	GitHub_M

Weaknesses

CWE-306 Missing Authentication for Critical Function
CWE-1385 Missing Origin Validation in WebSockets

Affected Products

Product	Versions
clinecline	<= 2.13.0Affected

References

https://github.com/cline/cline/security/advisories/GHSA-5c57-rqjx-35g2

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