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.
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Mon, 30 Mar 2026 19:15:00 +0000
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ssvc
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Mon, 30 Mar 2026 18:15:00 +0000
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| 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 |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-03-30T17:58:42.159Z
Updated: 2026-03-30T18:37:50.239Z
Reserved: 2026-03-17T17:22:14.670Z
Link: CVE-2026-33032
Updated: 2026-03-30T18:37:38.683Z
Status : Received
Published: 2026-03-30T18:16:19.410
Modified: 2026-03-30T19:16:25.683
Link: CVE-2026-33032
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