CVE-2026-44211
Cline Kanban Server has a Cross-Origin WebSocket Hijacking 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.
INFO
Published Date :
June 1, 2026, 5:17 p.m.
Last Modified :
July 22, 2026, 7:10 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Await vendor patch for Cline Kanban servers.
- Consider implementing server-side WebSocket origin validation.
- Restrict access to the Cline Kanban server.
- Monitor server activity for suspicious connections.
Public PoC/Exploit Available at Github
CVE-2026-44211 has a 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-44211.
| URL | Resource |
|---|---|
| https://github.com/cline/cline/security/advisories/GHSA-5c57-rqjx-35g2 | Exploit Mitigation Vendor Advisory |
| https://github.com/cline/cline/security/advisories/GHSA-5c57-rqjx-35g2 | Exploit Mitigation Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-44211 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-44211
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
A curated timeline of real AI agent security incidents, breaches, and vulnerabilities (2024-2026). Every entry sourced and dated.
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A deny-by-default contract & type-checker layer for AI agent tool calls — Pydantic-based, in-process, zero-core-deps. Validates the actual tool-call payload (ghost-arg stripping, strict types, self-healing retries) beneath MCP gateways & firewalls. Works with LangChain, OpenAI Agents SDK, PydanticAI & CrewAI.
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Python Makefile JavaScript HTML CSS Dockerfile
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-44211 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-44211 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Jul. 22, 2026
Action Type Old Value New Value Added Translation Title: Cline Kanban Server, Description: Cline es un agente de codificación autónomo como un SDK, extensión de IDE o asistente de CLI. En las versiones 2.13.0 y anteriores, existe una vulnerabilidad de secuestro de WebSocket de origen cruzado en los servidores Kanban de Cline. En el momento de la publicación, no hay parches disponibles públicamente. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'cline', 'product': 'cline', 'versions': [{'status': 'affected', 'version': '<= 2.13.0'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-44211', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-06-03T00:00:00+00:00'} -
Initial Analysis by [email protected]
Jun. 03, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:cline:cline:*:*:*:*:*:*:*:* versions up to (including) 2.13.0 Added Reference Type CISA-ADP: https://github.com/cline/cline/security/advisories/GHSA-5c57-rqjx-35g2 Types: Exploit, Mitigation, Vendor Advisory Added Reference Type GitHub, Inc.: https://github.com/cline/cline/security/advisories/GHSA-5c57-rqjx-35g2 Types: Exploit, Mitigation, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 01, 2026
Action Type Old Value New Value Added Reference https://github.com/cline/cline/security/advisories/GHSA-5c57-rqjx-35g2 -
New CVE Received by [email protected]
Jun. 01, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H Added CWE CWE-306 Added CWE CWE-1385 Added Reference https://github.com/cline/cline/security/advisories/GHSA-5c57-rqjx-35g2