CVE-2026-107804 · GHSA-9h23-53f4-q947
Nginx UI: Bundled reverse proxy can bypass IP allowlists and enable shared login lockout
- Risk score
- 44/100
- CVSS
- 5.3 v3.1
- Exploit chance (30 days)
- 0.2%
- Published
- 9 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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,…
- Affected
- github.com/0xJacky/Nginx-UI (go) >= 1.9.10-0.20251005005631-6de168c9454, < 1.9.10-0.20260904075558-e30e331303fc
- Fix
- Upgrade github.com/0xJacky/Nginx-UI to 1.9.10-0.20260904075558-e30e331303fc or later.
- Exploitation
- No known exploitation
Story map
At a glance
github.com/0xJacky/Nginx-UI: Amber, patch this week. Nginx UI is a web user interface for the Nginx web server. Prior to 2.4.1, config.ValidateConfigDirectives splits configuration by newline and checks only the first directive token on each line even though Nginx permits multiple semicolon-separated directives on one line. An authenticated caller can place a benign dir…
The flaws
- CVE-2026-107804: Nginx UI: Bundled reverse proxy can bypass IP allowlists and enable shared login lockout (CVSS 5.3 · EPSS 0%)
- CVE-2026-84316: Nginx UI: nginx config directive denylist (ValidateConfigFile) is bypassable via same-line ";" separation → authenticated directive injection (RCE on the official image) (CVSS 8.8 · EPSS 0%)
- CVE-2026-84317: Nginx UI: MCP nginx_config_add skips config directive validation → authenticated nginx directive injection (RCE on the official image) (CVSS 8.8 · EPSS 0%)
- CVE-2026-84318: Nginx UI: MCP `nginx_config_add` Bypasses Directive Validation — Authenticated RCE (CVSS 8.8 · EPSS 1%)
The fix
Upgrade github.com/0xJacky/Nginx-UI: 2.6.0 · 2.4.1 or later on your release line
Who is exposed: github.com/0xJacky/Nginx-UI (go) < 1.9.10-0.20260703131214-23d1934099b0
Where it stands
- Public proof of concept
Connects to
- Same weakness: CWE-346 (CWE-346). 54 other warnings in 30 days
Why it is Yellow
- CVSS 5.3 medium
- On your watchlist: nginx, Go
Affected packages
| Package | Ecosystem | Vulnerable | Fixed in |
|---|---|---|---|
| github.com/0xJacky/Nginx-UI | go | >= 1.9.10-0.20251005005631-6de168c9454, < 1.9.10-0.20260904075558-e30e331303fc | 1.9.10-0.20260904075558-e30e331303fc |
References
- https://github.com/advisories/GHSA-9h23-53f4-q947
- https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-9h23-53f4-q947
- https://nvd.nist.gov/vuln/detail/CVE-2026-107804
- https://github.com/0xJacky/nginx-ui/commit/e30e331303fc21cf077a2bea724bd79e66892eaf
- https://github.com/0xJacky/nginx-ui/releases/tag/v2.6.0
- https://github.com/advisories/GHSA-9h23-53f4-q947
Original 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.
Last activity 9 Oct 2026. Patch Forecast updates every hour.