CVE WatchOct 13, 2026

CVE-2026-84318

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 configura

CVSS

8.8

High

EPSS

0.6%

p49

KEV

—

Exploit Today

0-100

Published: Oct 12, 2026 · Last modified: Oct 13, 2026 · CWE-693

EPSS · 30d

0.6%EPSS · 30 days0.6%

2026-10-132026-10-23

Technical 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.

Official references

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