CVE-2026-42222

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

State: Published
Severity: 8.1 High
Published: May 4, 2026
Updated: May 6, 2026
Reserved: Apr 25, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.1 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H	GitHub_M

Weaknesses

CWE-306 Missing Authentication for Critical Function
CWE-284 Improper Access Control

Affected Products

Product	Versions
nginx-ui0xJacky	= 2.3.5Affected

References

https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-mxqh-q9h6-v8pq

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