CVE-2026-44211CWE-1385CWE-306

Cline Kanban Server has a Cross-Origin WebSocket Hijacking Vulnerability

Critical · published June 1, 2026

CVSS v3.1
9.6
EPSS
0%
Percentile
10.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.6 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00207 · 10.2th percentile
Weaknesses
CWE-1385 · Missing Origin Validation in WebSockets; CWE-306 · Missing Authentication for Critical Function
Published
2026-06-01T16:01Z
EPSS history
Timeline
  • 01 JUN 16:01Z
    Cline Kanban Server has a Cross-Origin WebSocket Hijacking Vulnerability
    cvelistv5