CVE-2026-107804 Nginx UI: Bundled reverse proxy can bypass IP allowlists and enable shared login lockout
Attackers can bypass IP allowlists and trigger shared login lockouts in Nginx UI by exploiting missing trusted proxy configuration in the bundled reverse proxy.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-107804?
CVE-2026-107804 is a medium-severity vulnerability in 0xJacky nginx-ui, published on 9 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-346
Which versions are affected by CVE-2026-107804?
3 open source packages ship an affected version, including github.com/0xJacky/Nginx-UI.
| Package | Affected | Fixed in |
|---|---|---|
github.com/0xJacky/Nginx-UI Go | All versions | 1.9.10-0.20260904075558-e30e331303fc |
github.com/0xJacky/Nginx-UI Go | From 1.9.10-0.20251005005631-6de168c9454 | 1.9.10-0.20260904075558-e30e331303fc |
github.com/0xJacky/Nginx-UI Go | From 1.9.10-0.20251005005631-6de168c9454 | 1.9.10-0.20260904075558-e30e331303fc |
How do I fix CVE-2026-107804?
Upgrade github.com/0xJacky/Nginx-UI to 1.9.10-0.20260904075558-e30e331303fc or later.
Is CVE-2026-107804 being exploited?
There is no known exploitation of CVE-2026-107804 in the wild and no public exploit code.
Sources
Also known as GHSA-9h23-53f4-q947, GO-2026-6724.