CVE-2026-34403— Nginx-UI vulnerable to Cross-Site WebSocket Hijacking (CSWSH) via missing origin validation on all WebSocket endpoints
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I. Basic Information for CVE-2026-34403
Vulnerability Information
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Vulnerability Title
Nginx-UI vulnerable to Cross-Site WebSocket Hijacking (CSWSH) via missing origin validation on all WebSocket endpoints
Source: NVD (National Vulnerability Database)
Vulnerability Description
Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.5, all WebSocket endpoints in nginx-ui use a gorilla/websocket Upgrader with CheckOrigin unconditionally returning true, allowing Cross-Site WebSocket Hijacking (CSWSH). Combined with the fact that authentication tokens are stored in browser cookies (set via JavaScript without HttpOnly or explicit SameSite attributes), a malicious webpage can establish authenticated WebSocket connections to the nginx-ui instance when a logged-in administrator visits the attacker-controlled page. Version 2.3.5 patches the issue.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
CWE-1385
Source: NVD (National Vulnerability Database)
Vulnerability Title
Nginx UI 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nginx UI是Jacky个人开发者的一个 Nginx 的 WebUI。 Nginx UI 2.3.5之前版本存在安全漏洞，该漏洞源于WebSocket端点未验证来源且身份验证令牌存储不安全，可能导致跨站WebSocket劫持攻击。
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
II. Public POCs for CVE-2026-34403
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IV. Related Vulnerabilities
Same product: nginx-ui
- CVE-2026-42238
Unauthenticated Remote Code Execution via Backup Restore in - CVE-2026-42223
nginx-ui: Settings API Exposes Protected Secrets - CVE-2026-42222
nginx-ui: Unauthenticated first-boot instance claim via POST - CVE-2026-42221
nginx-ui: Unauthenticated First-Run Installer Allows Remote - CVE-2026-42220
nginx-ui: Authenticated settings disclosure exposes node.sec
Same vendor: 0xJacky
- CVE-2026-42238
Unauthenticated Remote Code Execution via Backup Restore in - CVE-2026-42223
nginx-ui: Settings API Exposes Protected Secrets - CVE-2026-42222
nginx-ui: Unauthenticated first-boot instance claim via POST - CVE-2026-42221
nginx-ui: Unauthenticated First-Run Installer Allows Remote - CVE-2026-42220
nginx-ui: Authenticated settings disclosure exposes node.sec
Same weakness: CWE-1385
- CVE-2026-35589
nanobot: Cross-Site WebSocket Hijacking in WhatsApp Bridge ( - CVE-2026-27977
Next.js: null origin can bypass dev HMR websocket CSRF check - CVE-2026-1692
Missing origin validation in GraphicalData web service reque - CVE-2025-68930
Traccar Missing Origin Validation in WebSockets - CVE-2026-22689
Mailpit is vulnerable to Cross-Site WebSocket Hijacking (CSW
V. Comments for CVE-2026-34403
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