CVE-2026-33032
Nginx UI: Unauthenticated MCP Endpoint Allows Remote Nginx Takeover
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.
- Affected
- 0xJacky · nginx-ui
- CVSS v3.1 GITHUB
- 9.8 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS
- 2.52% chance of exploitation in the next 30 days, 85th percentile
- Nuclei
- critical · CWE-306
- Published
- 2026-03-30
- Updated
- 2026-04-16
Proof-of-concept exploits (3)
- advisories/GHSA-h6c2-x2m2-mwhf
- keraattin/CVE-2026-330325★ · 2026-04-18
- Baba01hacker666/CVE-2026-330320★ · 2026-08-21