CVE-2026-42222 PUBLISHED

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

Assigner: GitHub_M
Reserved: 25.04.2026 Published: 04.05.2026 Updated: 04.05.2026

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.

Metrics

CVSS 3.1

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

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	0xJacky
Product	nginx-ui
Versions	Version = 2.3.5 is affected

References

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

Problem Types

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