CVE-2026-84318
highNginx UI is a web user interface for the Nginx web server.
Nginx UI is a web user interface for the Nginx web server. From 2.0.0-rc.6 until 2.4.1, the MCP tool nginx_config_add writes nginx configuration files to disk and triggers an nginx reload without calling config.ValidateConfigFile. The identical flow in the REST API (POST /api/configs) does call that function and correctly rejects dangerous directives. An authenticated attacker can exploit this gap to write config files containing any blocked directive (perl, js_import, load_module, user root, etc.), bypassing nginx-ui's entire security layer. On a server with the nginx Perl, njs, or Lua module loaded, this is post-authentication Remote Code Execution. This issue is fixed in version 2.4.1.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/0xJacky/nginx-ui/commit/23d1934099b05b2a01589b48129dc3d3159d91c2 security-advisories@github.com
- https://github.com/0xJacky/nginx-ui/releases/tag/v2.4.1 security-advisories@github.com
- https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-9jww-cxg5-rj9m security-advisories@github.com
- https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-9jww-cxg5-rj9m 134c704f-9b21-4f2e-91b3-4a467353bcc0