CVE-2026-33032

CVE Enrichment

CVSS: 9.8 CRITICAL
EPSS: 2.52%
EPSS Percentile: 84.43%
CISA KEV: Not listed

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.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: security-advisories@github.com
Published: 31-Mar-2026 01:16
Last Modified: 17-Jun-2026 17:36
EPSS Date: 2026-10-11
CWE: CWE-306

CVSS Vector


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

Affected Products / Versions

nginxui / nginx_ui
Version / affected range: * · through (inclusive) 2.3.5
cpe:2.3:a:nginxui:nginx_ui:*:*:*:*:*:*:*:*

References

Last enrichment sync: 12-Oct-2026 09:36
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.

Reported Context (1)

Nginx UI's unauthenticated backup disclosure, CVE-2026-27944, and unauthenticated MCP endpoint, CVE-2026-33032, match the debug build's backup and MCP-chain artifacts. N4D Linux Malware Abuses MCP Tools and Scans for Exposed Services

CVE (4)

Malware (2)

People (1)

MITRE ATT&CK (11)

Products (22)

Tools (7)

Industries (1)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.