CVE-2026-33032

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.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-h6c2-x2m2-mwhf	Exploit Mitigation Vendor Advisory
https://websec.net/blog/cve-2026-33032-unauthenticated-nginx-ui-mcp-takeover-69e1200f9fceb1f3fbe9c47f
https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-h6c2-x2m2-mwhf	Exploit Mitigation Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:nginxui:nginx_ui:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-03-30 18:16

Updated : 2026-06-17 10:36

NVD link : CVE-2026-33032

Mitre link : CVE-2026-33032

CVE.ORG link : CVE-2026-33032

JSON object : View

Products Affected

nginxui

nginx_ui

CWE

CWE-306

Missing Authentication for Critical Function

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