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CVE-2026-59723— Cline: Cross-Origin WebSocket Hijacking in Cline Hub Dashboard (`/browser` endpoint)

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cline个人开发者开源的一个AI编程助手工具。 Cline 3.0.30之前版本存在输入验证错误漏洞，该漏洞源于Cline Hub仪表板服务器在/browser端点上接受WebSocket连接时未验证Origin标头，且当ROOM_SECRET未设置时，isAuthorizedBrowserRequest()允许攻击者控制的网站发送desktopCommand帧，从而读取工作区状态、修改MCP和提供者设置，并在配置了提供者或模型时触发命令执行。

CVSS 8.8 · High EPSS 0.14% · P4

Affected Version Matrix 1

VendorProduct Version RangeStatus
cline cline < 3.0.30 affected
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I. Basic Information for CVE-2026-59723

Vulnerability Information
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Vulnerability Title
Cline: Cross-Origin WebSocket Hijacking in Cline Hub Dashboard (`/browser` endpoint)
Source: CVE Program / CVE List V5
Vulnerability Description
Cline is an autonomous coding agent as an SDK, IDE extension, or CLI assistant. Prior to 3.0.30, the Cline Hub dashboard server launched by the cline dashboard command accepts WebSocket connections on the /browser endpoint without validating the Origin header, and when ROOM_SECRET is unset for local 127.0.0.1 binds, isAuthorizedBrowserRequest() allows attacker-controlled websites to send desktopCommand frames that read workspace state, mutate MCP and provider settings, and trigger command execution when a provider or model is configured. This issue is fixed in version 3.0.30.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5
Vulnerability Title
Cline 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
cline是cline个人开发者开源的一个AI编程助手工具。 Cline 3.0.30之前版本存在输入验证错误漏洞，该漏洞源于Cline Hub仪表板服务器在/browser端点上接受WebSocket连接时未验证Origin标头，且当ROOM_SECRET未设置时，isAuthorizedBrowserRequest()允许攻击者控制的网站发送desktopCommand帧，从而读取工作区状态、修改MCP和提供者设置，并在配置了提供者或模型时触发命令执行。
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 < 3.0.30 -

II. Public POCs for CVE-2026-59723

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8166 chars
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III. Intelligence Information for CVE-2026-59723

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Patches & Fixes for CVE-2026-59723 (1)

Vendor Advisories for CVE-2026-59723 (1)

Vendor Pages for CVE-2026-59723 (1)

IV. Related Vulnerabilities

Same product: cline
Same vendor: cline
Same weakness: CWE-346

V. Comments for CVE-2026-59723

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