Vulnerability · Published Oct 12, 2026 · Assigned by GitHub_M
CVE-2026-84316Nginx UI: nginx config directive denylist (ValidateConfigFile) is bypassable via same-line ";" separation → authenticated directive injection (RCE on the official image)
High 8.8
In plain English
A high-severity improper input validation in nginx-ui from 0xJacky. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 directive first and a restricted load_module, js_import, perl, or user root directive later on the same line, or can use an unrestricted include directive to load restricted content. These mechanisms bypass validation on REST, nginx_config_modify, site, and stream write paths; when an executable module is available, the injected configuration can execute code in the Nginx worker context. This issue is fixed in version 2.4.1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/0xJacky/Nginx-UI | 1.9.10-0.20260703131214-23d1934099b0 | GHSA-cf23-7qxj-xmhr |
| Go | github.com/0xJacky/Nginx-UI | 1.9.10-0.20260703131214-23d1934099b0 | GO-2026-6782 |
Affected products (as reported)
Weakness: CWE-20, CWE-184 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References
- https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-cf23-7qxj-xmhr x_refsource_CONFIRM
- https://github.com/0xJacky/nginx-ui/commit/23d1934099b05b2a01589b48129dc3d3159d91c2 x_refsource_MISC
- https://github.com/0xJacky/nginx-ui/releases/tag/v2.4.1 x_refsource_MISC