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.

INFO

Published Date :

2026-04-20T20:16:47.597Z

Last Modified :

2026-04-21T13:36:46.510Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2026-34403 vulnerability.

Vendors Products
0xjacky
  • Nginx-ui
Nginxui
  • Nginx Ui
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-34403.

URL Resource
https://github.com/0xJacky/nginx-ui/releases/tag/v2.3.5 cve-icon cve-icon
https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-78mf-482w-62qj cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Attack Requirements
Privileges Required
User Interaction
VS Confidentiality
VS Integrity
VS Availability
SS Confidentiality
SS Integrity
SS Availability
Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact