Detections
Analytics
CVE-2026-33032
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. 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.
References
https://www.infosecurity-magazine.com/news/nginx-ui-mcp-flaw-actively/
https://www.darkreading.com/application-security/critical-mcp-integration-flaw-nginx-risk
https://thehackernews.com/2026/04/critical-nginx-ui-vulnerability-cve.html
https://github.com/Baba01hacker666/CVE-2026-33032
https://github.com/barmi/cve-patch-auditor
https://github.com/keraattin/CVE-2026-33032
https://github.com/Shreda/CVE-2026-33032-nginx-ui-vuln-lab
https://github.com/sattyamjjain/agent-audit-kit
https://github.com/Twinson333/cve-2026-33032-scanner
https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-h6c2-x2m2-mwhf
Details
Published: 2026-03-30
Updated: 2026-04-16
Named Vulnerability: MCPwn
Risk Information
CVSS v2
Base Score: 10
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C
Severity: Critical
CVSS v3
Base Score: 9.8
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Severity: Critical
EPSS
EPSS: 0.36299
Vulnerability Watch
Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.
Vulnerability of Interest