CVE-2026-107804 — Nginx UI: Bundled reverse proxy can bypass IP allowlists and enable shared login lockout
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 t…
Published: 2026-10-09 · CVSS: 5.3 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7