CVE-2026-84319 Details
Description
Nginx UI is a web user interface for the Nginx web server. Prior to 2.4.1, the regular HTTP configuration API rejects restricted Nginx directives such as load_module, js_import, and js_content. However, the MCP configuration interface allows a secondary authenticated user to write and apply equivalent restricted configuration content. This allows the user to load ngx_http_js_module.so, import attacker-controlled JavaScript, reload Nginx, and execute NJS in the Nginx worker context. This issue is fixed in version 2.4.1.
A vulnerability in the Nginx UI web user interface for Nginx web server, prior to version 2.4.1, allows a secondary authenticated user to bypass restrictions on certain Nginx directives. While the regular HTTP configuration API properly rejects directives like load_module, js_import, and js_content, the MCP configuration interface does not. This flaw enables the user to load the JavaScript module ngx_http_js_module.so, import and execute attacker-controlled JavaScript in the Nginx worker context. The vulnerability arises from the MCP interface's lack of validation on restricted directives, which is enforced by the HTTP API.
Users can update to Nginx UI version 2.4.1, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 12, 2026CISA-ADP
Assessed Oct 13, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/0xJacky/nginx-ui/commit/23d1934099b05b2a01589b48129dc3d3159d91c2 | [email protected] | Source CodeVendor |
| https://github.com/0xJacky/nginx-ui/releases/tag/v2.4.1 | [email protected] | Release NotesVendor |
| https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-5r62-gj48-897x | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-693 | Protection Mechanism Failure | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| 0xJacky Nginx UI | >= 2, < 2.4.1 |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 13, 2026 | CVE Modified | CISA-ADP |
| Oct 12, 2026 | New CVE Received | [email protected] |