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Vulnerability record · CVE-2026-42222 · published 4 May 2026

CVE-2026-42222: Nginxui nginx ui improper access control vulnerability

Nginxui · Nginx Ui

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.

9.8 CVSS 3.1 Critical EPSS 0.47% · top 61.5% CWE-284 · Improper access controlCWE-306 · Missing authentication for critical function
9.8CVSS 3.1 base score
0.47%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.9CVE-2026-44015Nginxui nginx ui server-side request forgery (ssrf) vulnerabilityNginx UI is a web user interface for the Nginx web server. In 2.3.4 and earlier, an authenticated user can perform Server-Side Request Forgery (SSRF)…EPSS 0.39%9.9CVE-2026-33030Nginxui nginx ui os command injection vulnerabilityNginx UI is a web user interface for the Nginx web server. In versions 2.3.3 and prior, Nginx-UI contains an Insecure Direct Object Reference (IDOR) …EPSS 0.38%9.8CVE-2026-42221Nginxui nginx ui missing authentication for critical function vulnerabilityNginx UI is a web user interface for the Nginx web server. From version 2.0.0 to before version 2.3.8, an unauthenticated network attacker can claim …EPSS 1.6%9.8CVE-2026-33032Nginxui nginx ui missing authentication for critical function vulnerabilityNginx UI is a web user interface for the Nginx web server. In versions 2.3.5 and prior, the nginx-ui MCP (Model Context Protocol) integration exposes…EPSS 2.5%9.8CVE-2026-27944Nginxui nginx ui missing authentication for critical function vulnerabilityNginx UI is a web user interface for the Nginx web server. Prior to version 2.3.3, the /api/backup endpoint is accessible without authentication and …EPSS 1.0%9.8CVE-2024-23827Nginxui nginx ui path traversal vulnerabilityNginx-UI is a web interface to manage Nginx configurations. The Import Certificate feature allows arbitrary write into the system. The feature does n…EPSS 0.70%9.4CVE-2026-33026Nginxui nginx ui cleartext storage of sensitive data vulnerabilityNginx UI is a web user interface for the Nginx web server. Prior to version 2.3.4, the nginx-ui backup restore mechanism allows attackers to tamper w…EPSS 0.21%9.0CVE-2026-42238Nginxui nginx ui code injection vulnerabilityNginx UI is a web user interface for the Nginx web server. Prior to version 2.3.8, nginx-ui exposes a backup restore endpoint (POST /api/restore) tha…EPSS 0.83%

Source: NIST National Vulnerability Database (record CVE-2026-42222), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.