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.

Project Subscriptions

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-h6c2-x2m2-mwhf nginx-ui's Unauthenticated MCP Endpoint Allows Remote Nginx Takeover
Fixes

Solution

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Workaround

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History

Mon, 30 Mar 2026 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 30 Mar 2026 18:15:00 +0000

Type Values Removed Values Added
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.
Title Nginx UI: Unauthenticated MCP Endpoint Allows Remote Nginx Takeover
Weaknesses CWE-306
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-30T18:37:50.239Z

Reserved: 2026-03-17T17:22:14.670Z

Link: CVE-2026-33032

cve-icon Vulnrichment

Updated: 2026-03-30T18:37:38.683Z

cve-icon NVD

Status : Received

Published: 2026-03-30T18:16:19.410

Modified: 2026-03-30T19:16:25.683

Link: CVE-2026-33032

cve-icon Redhat

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cve-icon OpenCVE Enrichment

No data.

Weaknesses