CVE-2026-44211 PUBLISHED

Cline Kanban Server has a Cross-Origin WebSocket Hijacking Vulnerability

Assigner: GitHub_M
Reserved: 05.05.2026 Published: 01.06.2026 Updated: 01.06.2026

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.

Metrics

CVSS 3.1

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

Attack Vector	Network	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	Required	Availability Impact	High

CVSS 3.1

Product Status

Vendor	cline
Product	cline
Versions	Version <= 2.13.0 is affected

References

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

Problem Types

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