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CVE-2026-33032 PoC — Nginx UI: Unauthenticated MCP Endpoint Allows Remote Nginx Takeover

Source
https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-33032.yaml
Associated Vulnerability
Title:Nginx UI: Unauthenticated MCP Endpoint Allows Remote Nginx Takeover (CVE-2026-33032)
Description:Nginx UI is a web user interface for the Nginx web server. In versions 2.3.5 and prior, the nginx-ui MCP (Model Context Protocol) integration exposes two HTTP endpoints: /mcp and /mcp_message. While /mcp requires both IP whitelisting and authentication (AuthRequired() middleware), the /mcp_message endpoint only applies IP whitelisting - and the default IP whitelist is empty, which the middleware treats as "allow all". This means any network attacker can invoke all MCP tools without authentication, including restarting nginx, creating/modifying/deleting nginx configuration files, and triggering automatic config reloads - achieving complete nginx service takeover. At time of publication, there are no publicly available patches.
Description
Network attackers can fully control nginx service, including config modification and service restart, leading to complete service takeover.
File Snapshot

 id: CVE-2026-33032

info:
  name: Nginx UI - Broken Access Control
  author: DhiyaneshDk
  severity:

...
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