CVE-2026-42221 | BDVDB-2026-330365 Detail

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.

Impact#

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Exploit#

History#

1. Version 12026-05-04Record published in the CVE List.
2. Version 22026-05-05Most recent update recorded in the CVE List.