CVE-2026-33032
CVE-2026-33032
9.8
CriticalPublished:
Last updated:
Source:security-advisories@github.com
Modified
Weakness (CWE)
CVSS Vector
v3.1- Attack Vector
- Network
- Attack Complexity
- Low
- Privileges Required
- None
- User Interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
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.
References
security-advisories@github.com
https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-h6c2-x2m2-mwhfaf854a3a-2127-422b-91ae-364da2661108
https://websec.net/blog/cve-2026-33032-unauthenticated-nginx-ui-mcp-takeover-69e1200f9fceb1f3fbe9c47f134c704f-9b21-4f2e-91b3-4a467353bcc0
https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-h6c2-x2m2-mwhf