CVE-2026-42222
Undergoing Analysis Undergoing Analysis - In Progress
Unauthenticated Bootstrap Takeover in Nginx UI

Publication date: 2026-05-04

Last updated on: 2026-05-06

Assigner: GitHub, Inc.

Description
Nginx UI is a web user interface for the Nginx web server. In version 2.3.5, an unauthenticated bootstrap takeover exists in nginx-ui during the initial installation window exposed by POST /api/install. At time of publication no public patches are available.
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Meta Information
Published
2026-05-04
Last Modified
2026-05-06
Generated
2026-06-16
AI Q&A
2026-05-05
EPSS Evaluated
2026-06-15
NVD
CVE-2026-42222
EUVD
EUVD-2026-27137
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
nginxui nginx_ui 2.3.5
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-306 The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
CWE-284 The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
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Executive Summary

This vulnerability exists in the Nginx UI version 2.3.5, which is a web user interface for the Nginx web server. It involves an unauthenticated bootstrap takeover during the initial installation window, which is exposed by the POST /api/install endpoint. This means that an attacker can potentially take control of the installation process without needing to authenticate.

Impact Analysis

The vulnerability can have a severe impact as it allows an attacker to take over the bootstrap process without authentication. According to the CVSS score of 8.1, it can lead to high confidentiality, integrity, and availability impacts, meaning sensitive data could be exposed or altered, and the system could be disrupted or controlled by an attacker.

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