CVE-2026-33032
CWE-306Published: March 30, 2026· Updated: Apr 1, 2026
Official 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 Analysis
CVE-2026-33032 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.
CISA has added CVE-2026-33032 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
News & Research Mentioning CVE-2026-33032
Hackers are exploiting CVE-2026-33032, a critical remote takeover vulnerability in the Nginx UI management tool. The post Exploited Vulnerability Exposes Nginx Servers to Hacking appeared first on SecurityWeek. [xlite_meta score:50 src:SecurityWeek xlite_fp:0a4ebd01e9246c2c2af5e1080d37efa45e51ef6cbb6ec87a9e56ecac9e98d134]
Critical nginx-ui MCP authentication bypass CVE-2026-33032 actively exploited with CVSS 9.8
A recently disclosed critical security flaw impacting nginx-ui, an open-source, web-based Nginx management tool, has come under active exploitation in the wild. The vulnerability in question is CVE-2026-33032 (CVSS score: 9.8), an authentication bypass vulnerability that enables threat actors to seize control of the Nginx service. It has been codenamed MCPwn by Pluto Security. " [xlite_meta score:59 src:The Hacker News xlite_fp:23dceb505814d83d102ab9921db4fd1c6af1a21f12958410eb94ea58870c298a]
All References (2)
Quick Facts
Known Threat Actors
Related CVEs (CWE-306)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2026-33032 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1