id: CVE-2026-33032

info:
  name: "Nginxui - Missing Authentication"
  author: vedas-arpsyndicate
  severity: critical
  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.
  reference:
    - https://www.exploit.observer/?keyword=CVE-2026-33032&match=exact
    - https://subdomain.center/?engine=ammonites&keyword=nginxui&match=exact
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2026-33032
    cwe-id: CWE-306
  metadata:
    verified: false
  tags: cve,cve2026,nginx-ui,mcp,unauth,misconfig,vkev,nginxui
variables:
  string: "{{to_lower(rand_text_alpha(5))}}"

http:
  - raw:
      - |
        POST /mcp_message HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json

        {"jsonrpc":"2.0","method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"{{string}}","version":"1.0"}},"id":1}

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '{"jsonrpc":'
          - '"message":'
          - '"id":'
        condition: and

      - type: status
        status:
          - 400