CVE-2026-42221

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.

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Produits concernés

• 0xJacky nginx-ui
• Nginxui nginx ui

Scores CVSS

Faiblesses (CWE)

• CWE-306

Références

• https://github.com/0xJacky/nginx-ui/releases/tag/v2.3.8 Release Notes
• https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-h27v-ph7w-m9fp ExploitMitigationVendor Advisory
• https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-h27v-ph7w-m9fp ExploitMitigationVendor Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories