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bdu:2026-06343

EUVD-2026-308572

fkie_cve-2026-42221

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.

GHSA-h27v-ph7w-m9fp — Nginx-UI: Unauthenticated First-Run Installer Allows Remote Initial Admin Claim

Affected: Go: github.com/0xJacky/Nginx-UI

### Summary 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.

### Details The vulnerable route is exposed publicly through the main API router. `router/routers.go:61-70` mounts `system.InitPublicRouter(root)` under `/api`, and `api/system/router.go:16-19` registers both `GET /api/install` and `POST /api/install` without `AuthRequired()`.

The install handler only checks whether the instance is already installed and whether more than ten minutes have elapsed since startup. `api/system/install.go:26-33` treats the instance as uninstalled when `JwtSecret` is empty and `SkipInstallation` is false. `api/system/install.go:56-69` rejects requests only if installation has already happened or the ten-minute window has expired.

If those checks pass, the unauthenticated caller controls the initialization flow. `api/system/install.go:77-81` generates and saves the JWT secret, node secret, and certificate email from attacker-controlled input, and `api/system/install.go:93-97` overwrites user ID `1` with the attac…

WID-SEC-W-2026-1276 — nginx-ui: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in nginx-ui ausnutzen, um beliebigen Code mit Root-Rechten auszuführen, sich Administratorrechte zu verschaffen und die vollständige Kontrolle über das System zu erlangen oder vertrauliche Informationen offenzulegen.