CVE-2026-34403

The record

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.

Affected packages

Related vulnerabilities

• CVE-2026-85183 Taipy configures its socket.io server with wildcard CORS origin and credential flag… CWE-1385
• CVE-2026-59950 The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context… CWE-1385
• CVE-2026-57111 Permissive Cross-Origin Resource Sharing (CORS) in the REST API (helix-rest… CWE-1385
• CVE-2026-10054 In affected versions of Eclipse Theia (1.8.1 and later), the browser backend exposes… CWE-1385
• CVE-2026-44211 Cline is an autonomous coding agent as an SDK, IDE extension, or CLI assistant. CWE-1385
• CVE-2026-44514 Kubetail is a real-time logging dashboard for Kubernetes. CWE-1385
• GHSA-5c57-rqjx-35g2 Cline Kanban Server has a Cross-Origin WebSocket Hijacking Vulnerability CWE-1385
• CVE-2026-35589 nanobot is a personal AI assistant. CWE-1385