Nginx UI: Bundled reverse proxy can bypass IP allowlists and enable shared login lockout

[ Description ]Official description

Nginx UI is a web user interface for the Nginx web server. From 2.2.0 until 2.6.0, the bundled reverse proxy does not preserve the external client identity used by Gin because the backend has no trusted proxy configuration. Management requests can be attributed to loopback and pass the IP allowlist loopback exception, although valid credentials are still required. Failed logins from different external clients are also attributed to the same loopback address, allowing an unauthenticated attacker to trigger a shared temporary login ban for password or OTP authentication without invalidating existing sessions. This issue is fixed in version 2.6.0.

[ Fixes ]Fixes and patches

• github.com/0xJacky/Nginx-UI 1.9.10-0.20260904075558-e30e331303fcFixed version · GitHub Advisories · go package github.com/0xJacky/Nginx-UI: upgrade to 1.9.10-0.20260904075558-e30e331303fc or later (affected >= 1.9.10-0.20251005005631-6de168c9454, < 1.9.10-0.20260904075558-e30e331303fc)

[ Advisories ]Government CERT advisories

• BSI CERT-Bund29 Sep 2026WID-SEC-2026-3668

  nginx-ui: Multiple vulnerabilities Translated from German

  CVE-2026-107804CVE-2026-107805

[ Packages ]Affected open-source packages

• github.com/0xJacky/Nginx-UI goAffected >= 1.9.10-0.20251005005631-6de168c9454, < 1.9.10-0.20260904075558-e30e331303fc · fixed in 1.9.10-0.20260904075558-e30e331303fc · GHSA-9h23-53f4-q947

[ References ]References

• github.com/0xJacky/nginx-ui/commit/e30e331303fc21cf077a2bea724bd79e66892eaf
• github.com/0xJacky/nginx-ui/releases/tag/v2.6.0
• github.com/0xJacky/nginx-ui/security/advisories/GHSA-9h23-53f4-q947