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CVE-2026-44211— Cline Kanban Server has a Cross-Origin WebSocket Hijacking Vulnerability

Quick assessment

Affected
cline cline
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cline是necboy个人开发者的一个集成CLI和编辑器的AI编程助手。 Cline 2.13.0及之前版本存在安全漏洞，该漏洞源于跨源WebSocket劫持，可能导致攻击者劫持Kanban服务器。

CVSS 9.6 · Critical EPSS 0.18% · P8

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 1

VendorProduct Version RangeStatus
cline cline <= 2.13.0 affected
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I. Basic Information for CVE-2026-44211

Vulnerability Information
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Vulnerability Title
Cline Kanban Server has a Cross-Origin WebSocket Hijacking Vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Cline 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cline是necboy个人开发者的一个集成CLI和编辑器的AI编程助手。 Cline 2.13.0及之前版本存在安全漏洞，该漏洞源于跨源WebSocket劫持，可能导致攻击者劫持Kanban服务器。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
cline cline <= 2.13.0 -

II. Public POCs for CVE-2026-44211

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 11904 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-44211

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Vendor Advisories for CVE-2026-44211 (1)

IV. Related Vulnerabilities

Same product: cline
Same vendor: cline
Same weakness: CWE-306

V. Comments for CVE-2026-44211

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