{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "2.0.0-rc.6"
              },
              {
                "fixed": "2.4.1"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "1330888280a244552402accf7b26abab6c2dcb9a"
            },
            {
              "fixed": "23d1934099b05b2a01589b48129dc3d3159d91c2"
            },
            {
              "fixed": "0540f3ecf7824e9adbe408f3166d151651ccf4dd"
            }
          ],
          "repo": "https://github.com/0xjacky/nginx-ui",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-9jww-cxg5-rj9m"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-693"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84318.json"
  },
  "details": "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.",
  "id": "CVE-2026-84318",
  "modified": "2026-10-15T02:31:04.857392853Z",
  "published": "2026-10-12T20:20:18.595Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/0xJacky/nginx-ui/releases/tag/v2.4.1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-9jww-cxg5-rj9m"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84318.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-84318"
    },
    {
      "type": "FIX",
      "url": "https://github.com/0xJacky/nginx-ui/commit/23d1934099b05b2a01589b48129dc3d3159d91c2"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Nginx UI: MCP `nginx_config_add` Bypasses Directive Validation — Authenticated RCE"
}