CVE-2026-33032: Nginxui Nginx Ui

What is 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.

CVSS9.8 NVD 3.1

SeverityCRITICAL

ExploitationNo exploitation reported

EPSS38% · P98

Triage statusNo Known Exploit

ActionPatch within 48 hours

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD published2026-03-30

NVD last modified2026-06-17

Timeline

2026-03-30Published to the U.S. National Vulnerability Database (NVD)
2026-04-16First covered in a defend.network daily briefing
2026-06-17NVD record last updated

Affected product

Nginxui Nginx Ui

References

Referenced in our briefings & reports

nginx-ui auth bypass exploited; SharePoint zero-day in 169 patches (2026-04-16)

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🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.

What is CVE-2026-33032?

Timeline

Affected product

References

Referenced in our briefings & reports

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