CVE-2026-42222 HIGH

CVE-2026-42222: nginx-ui: Unauthenticated first-boot instance claim via POST /api/install allows remote bootstrap takeover

Vendor 0Xjacky

Product nginx-ui

Weakness CWE-306 · Missing auth

Published May 4, 2026

Last update May 6, 2026

View on NVD All CVEs

CVSS base score

8.1/10

Attack vector Network

Attack complexity High

Privileges required None

User interaction None

Confidentiality High

Integrity High

CVSS vector

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

What the vulnerability does

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.

Key dates

Disclosure timeline

May 4, 2026 CVE published

May 6, 2026 Record updated