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CVE-2026-33032

Nginx UI: Unauthenticated MCP Endpoint Allows Remote Nginx Takeover

Basic Information

CVE State
PUBLISHED
Reserved Date
March 17, 2026
Published Date
March 30, 2026
Last Updated
April 16, 2026
Vendor
0xJacky
Product
nginx-ui
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.
Tags
nuclei_scanner

CVSS Scores

CVSS v3.1

9.8 - CRITICAL

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC Information

Exploitation
poc
Automatable
Yes
Technical Impact
total

Exploit Status

Exploited in the Wild
Yes (2026-04-15 16:05:13 UTC) Source

References

https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-h6c2-x2m2-mwhf

Known Exploited Vulnerability Information

Source Added Date
The Shadowserver (via CIRCL) 2026-04-15 16:05:13 UTC

Scanner Integrations

Scanner URL Date Detected
Nuclei https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-33032.yaml 2026-06-01 15:34:44 UTC

Timeline

  • CVE ID Reserved

  • CVE Published to Public

  • Added to KEVIntel

  • Detected by Nuclei