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VulnerabilityPublished Updated

CVE-2026-33032: 0xJacky nginx-ui · Missing Authentication

Affects 0xJacky nginx-uiSource CVE Database V5

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Exposed hosts seen by OffSeq Mirage · public detection template (Nuclei) · 35% EPSS · CVSS 9.8 Critical.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score
9.8Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
35.2% chance of exploitation in 30 days – higher than 98% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 30 Mar 2026

  2. Weaponized: evidence found.

    Public exploit code: GitHub proofs of concept

  3. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  4. Observed by OffSeq Mirage: evidence found.

    1 exposed host found; no attack traffic recorded

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), GitHub proofs of concept, OffSeq Mirage (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
0xJackynginx-uiAffected
  • <=2.3.5
Fixed in–
GitHub0xjacky/nginx-uipkg:github/0xjacky/nginx-uiOther threatsAffected
  • <=2.3.5
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

At the time of publication, no official patches or fixes are available for this vulnerability. Users should monitor the vendor's advisory channels for updates. As a temporary mitigation, restricting network access to the /mcp_message endpoint by implementing external network controls such as firewall rules or VPN access may reduce exposure. Avoid exposing the nginx-ui interface to untrusted networks until a patch is released.

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.

References

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