CVE-2026-42222

nginx-ui: Unauthenticated first-boot instance claim via POST /api/install allows remote bootstrap takeover

Published May 4, 2026 CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-mxqh-q9h6-v8pq Nginx-UI: Unauthenticated first-boot instance claim via POST /api/install allows remote bootstrap takeover
History
Type Values Removed Values Added
First Time appeared Nginxui
Nginxui nginx Ui
CPEs cpe:2.3:a:nginxui:nginx_ui:2.3.5:*:*:*:*:*:*:*
Vendors & Products Nginxui
Nginxui nginx Ui
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared 0xjacky
0xjacky nginx-ui
Vendors & Products 0xjacky
0xjacky nginx-ui
Type Values Removed Values Added
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.
Title nginx-ui: Unauthenticated first-boot instance claim via POST /api/install allows remote bootstrap takeover
Weaknesses CWE-284
CWE-306
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
May 6, 2026, 1:58 PM
Reserved
Apr 25, 2026, 5:37 AM
Status
Analyzed
Published
May 4, 2026, 9:16 PM
Modified
Oct 26, 2026, 7:10 PM