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CVE-2026-59804— Midscene Bridge Server - Session Hijack via Unauthenticated WebSocket

Quick assessment

Affected
web-infra-dev midscene
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Web Infra Midscene.js是Web Infra公司开源的一款开源的、基于视觉驱动的 UI 自动化工具，让你用自然语言描述就能在任意平台（Web、Android、iOS、桌面应用等）上完成自动化测试和操作，无需维护脆弱的 DOM 选择器。 Web Infra Midscene.js 1.10.3及之前版本存在安全漏洞，该漏洞源于缺少身份验证和CORS配置错误，可能导致未经身份验证的远程攻击者通过向本地Socket.IO服务器打开跨源WebSocket连接劫持活动桥接会话，该服务器不执行Ori

CVSS 6.8 · Medium EPSS 0.31% · P24

Affected Version Matrix 2

VendorProduct Version RangeStatus
web-infra-dev midscene ≤ 1.10.3 affected
86f4118d1d847041c63d79e347e08c87c3f1a882 unaffected
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I. Basic Information for CVE-2026-59804

Vulnerability Information
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Vulnerability Title
Midscene Bridge Server - Session Hijack via Unauthenticated WebSocket
Source: CVE Program / CVE List V5
Vulnerability Description
Midscene Bridge Server through 1.10.3, fixed in commit 86f4118, contains a missing authentication and CORS misconfiguration vulnerability that allows unauthenticated remote attackers to hijack active bridge sessions by opening a cross-origin WebSocket connection to the local Socket.IO server, which performs no Origin header validation and requires no authentication token. Attackers can connect from any web page visited by the victim to seize the single-client slot, intercept and inject automation commands, exfiltrate command-payload data, or unconditionally terminate the server by supplying the MIDSCENE_BRIDGE_SIGNAL_KILL query parameter.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1385
Source: CVE Program / CVE List V5
Vulnerability Title
Web Infra Midscene.js 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Web Infra Midscene.js是Web Infra公司开源的一款开源的、基于视觉驱动的 UI 自动化工具，让你用自然语言描述就能在任意平台（Web、Android、iOS、桌面应用等）上完成自动化测试和操作，无需维护脆弱的 DOM 选择器。 Web Infra Midscene.js 1.10.3及之前版本存在安全漏洞，该漏洞源于缺少身份验证和CORS配置错误，可能导致未经身份验证的远程攻击者通过向本地Socket.IO服务器打开跨源WebSocket连接劫持活动桥接会话，该服务器不执行Ori
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
web-infra-dev midscene 0 ~ 1.10.3 -

II. Public POCs for CVE-2026-59804

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III. Intelligence Information for CVE-2026-59804

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Patches & Fixes for CVE-2026-59804 (2)

Vendor Advisories for CVE-2026-59804 (1)

News Coverage for CVE-2026-59804 (1)

IV. Related Vulnerabilities

Same vendor: web-infra-dev
Same weakness: CWE-1385

V. Comments for CVE-2026-59804

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