Vulnerability · Published Oct 12, 2026 · Assigned by GitHub_M

CVE-2026-84319Nginx UI: MCP configuration tools bypass restricted directive validation and allow secondary authenticated users to execute NJS in Nginx worker context

High 8.3

In plain English

A high-severity security flaw in nginx-ui from 0xJacky. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.3High

Exploit odds (30 days)0.3%top 79.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/0xJacky/Nginx-UI	1.9.10-0.20260703131214-23d1934099b0	GHSA-5r62-gj48-897x
Go	github.com/0xJacky/Nginx-UI	1.9.10-0.20260703131214-23d1934099b0	GO-2026-6774

Affected products (as reported)

Vendor	Product	Versions
0xJacky	nginx-ui	< 2.4.1

Weakness: CWE-693 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H

References

https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-5r62-gj48-897x 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