fkie_cve-2026-107808

Nginx UI is a web user interface for the Nginx web server. From 2.0.0 until 2.5.0, POST /api/login checks EnabledOTP but does not require a WebAuthn assertion when EnabledPasskey is true and no TOTP secret is configured. A passkey-only account is therefore issued a session after password verification, despite Enabled2FA reporting that the account has a second factor. An attacker who obtains the password can take over the account and reach administrative functionality without the registered passkey. This issue is fixed in version 2.5.0.

GHSA-45gv-9wjv-xh7p — Nginx UI: Authentication bypass: password login does not enforce a passkey-only second factor (2FA bypass)

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

## Summary

nginx-ui supports two second-factor methods — TOTP (OTP) and WebAuthn passkeys — and reports an account as 2FA-enabled when **either** is configured. However, the password login endpoint (`POST /api/login`) only enforces a second factor when a **TOTP secret** is present. An account that has registered a **passkey but no TOTP** is logged in after password verification alone — the passkey is never requested. This silently downgrades a passkey-protected account to single-factor (password-only) authentication.

## Details

The account's 2FA policy treats passkeys as a valid factor (`model/user.go`):

```go func (u *User) EnabledOTP() bool { return len(u.OTPSecret) != 0 } func (u *User) EnabledPasskey() bool { /* true if a passkey row exists */ } func (u *User) Enabled2FA() bool { return u.EnabledOTP() || u.EnabledPasskey() }

func (u *User) AfterFind(_ *gorm.DB) error { u.EnabledTwoFA = u.Enabled2FA() // exposed to the UI as `enabled_2fa` return nil } ```

But the login handler only checks `EnabledOTP()` (`api/user/auth.go`, `Login`):

```go u, err := user.Login(json.Name, json.Password) ... if u.EnabledOTP() { // <-- only TOTP is enforced if json.OTP == "" && json.RecoveryCode == "" { c.JSON(http.StatusOK, LoginResponse{Message: "The user has enabled 2FA", Code: Enabled2FA}) // 199 user.BanIP(clientIP) return } if _, err = user.VerifyOTP(u, json.OTP, json.RecoveryCode); err != nil { /* ... */…

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fkie_cve-2026-107808

GHSA-45gv-9wjv-xh7p — Nginx UI: Authentication bypass: password login does not enforce a passkey-only second factor (2FA bypass)