CVE-2026-42222 — HIGH (8.1)

Vulnerability 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.

CVSS Score

8.1

HIGH

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

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Nginxui	Nginx Ui	2.3.5

Related Weaknesses (CWE)

CWE-306 CWE-284

References

https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-mxqh-q9h6-v8pqExploitVendor Advisory
https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-mxqh-q9h6-v8pqExploitVendor Advisory

FAQ

What is CVE-2026-42222?

CVE-2026-42222 is a vulnerability with a CVSS score of 8.1 (HIGH). 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/instal...

How severe is CVE-2026-42222?

CVE-2026-42222 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-42222?

Check the references section above for vendor advisories and patch information. Affected products include: Nginxui Nginx Ui.