CVE-2026-33032
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.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/0xJacky/Nginx-UIGo | <= 1.99 | — |
Affected products
1Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
6- github.com/0xJacky/nginx-ui/security/advisories/GHSA-h6c2-x2m2-mwhfnvdExploitMitigationVendor AdvisoryWEB
- github.com/advisories/GHSA-h6c2-x2m2-mwhfghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-33032ghsaADVISORY
- github.com/0xJacky/nginx-ui/blob/f89f8ff8223478988f7ed49bf1d3dbf2de44bf92/internal/middleware/ip_whitelist.goghsaWEB
- github.com/0xJacky/nginx-ui/blob/f89f8ff8223478988f7ed49bf1d3dbf2de44bf92/mcp/router.goghsaWEB
- websec.net/blog/cve-2026-33032-unauthenticated-nginx-ui-mcp-takeover-69e1200f9fceb1f3fbe9c47fnvdWEB
News mentions
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