🛡️ CVE-2026-42221
🟠 CVSS 8.1 — High ✅ No Known Exploit CWE-306 NVD
8.1
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Nginx 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 the initial administrator account on a fresh nginx-ui instance during the first-run setup window. The public /api/install endpoint is reachable without authentication, and the request-encryption flow only protects payload confidentiality in transit; it does not authenticate who is allowed to perform installation. A remote attacker who reaches the service before the legitimate operator can set the admin email, username, and password, causing permanent initial-instance takeover. This issue has been patched in version 2.3.8.

Details

Severity HIGH
CVSS Score 8.1
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE CWE-306
Public Exploit ✅ No
Source NVD
Published 2026-05-06
Updated 2026-06-02
Modified 2026-05-06
Fix URL N/A

Affected Packages

Software From version Fixed in
github.com/0xjacky/nginx-ui — —
nginx-ui 2.0.0 2.3.8

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