CVE-2026-84318: CWE-693: Protection Mechanism Failure in 0xJacky nginx-ui
Description
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 v3.1
Score 8.8high
Affected software
0xJacky
nginx-ui
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-09-01T16:17:43.079Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6acd47ba2cdf04f656d18fbb
Added to database: 10/12/2026, 20:48:58 UTC
Last updated: 10/12/2026, 20:48:58 UTC
Views: 1
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