CVE-2026-33032

CRITICAL EXPLOITED NUCLEI LAB

Nginx UI: Unauthenticated MCP Endpoint Allows Remote Nginx Takeover

Title source: cna

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.

Exploits (3)

nomisec SCANNER
by keraattin · poc
https://github.com/keraattin/CVE-2026-33032
nomisec WORKING POC
by Shreda · remote
https://github.com/Shreda/CVE-2026-33032-nginx-ui-vuln-lab
nomisec SCANNER
by Twinson333 · poc
https://github.com/Twinson333/cve-2026-33032-scanner

Nuclei Templates (1)

Nginx UI - Broken Access Control
CRITICALVERIFIEDby DhiyaneshDk
Shodan: http.title:"Nginx UI"
FOFA: title="Nginx UI"

References (2)

Scores

CVSS v3 9.8
EPSS 0.0932
EPSS Percentile 92.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Lab Environment

COMMUNITY
Community Lab
docker pull uozi/nginx-ui:v2.3.1

Details

VulnCheck KEV 2026-04-13
CWE
CWE-306
Status published
Products (3)
0xJacky/Nginx-UI 0Go
0xJacky/nginx-ui <= 2.3.5
nginxui/nginx_ui < 2.3.5
Published Mar 30, 2026
Tracked Since Mar 31, 2026