CVE-2026-5524

{
  "id": "CVE-2026-5524",
  "sourceIdentifier": "[email protected]",
  "published": "2026-07-02T13:17:00.587",
  "lastModified": "2026-10-25T21:10:00.770",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The Divi Form Builder plugin for WordPress is vulnerable to Arbitrary File Upload leading to Remote Code Execution in all versions up to and including 5.1.8. This is due to insufficient file extension validation in the do_image_upload() function where user-supplied input from the acceptFileTypes POST parameter is directly interpolated into a regular expression used to validate uploaded files. Attackers can specify PHP-executable extensions such as .phtml, .phar, .php5, or .php7 to bypass the plugin's .htaccess protection which only blocks .php files specifically. Additionally, on Nginx-based servers, the .htaccess protection is completely ineffective as Nginx does not process .htaccess files. This makes it possible for unauthenticated attackers (who can obtain a nonce from any public page containing a form) to upload executable PHP files to the publicly accessible /wp-content/uploads/de_fb_uploads/ directory and achieve Remote Code Execution by accessing the uploaded file via HTTP. The vulnerability was partially patched in version 5.1.3."
    },
    {
      "lang": "es",
      "value": "El plugin Divi Form Builder para WordPress es vulnerable a la Carga Arbitraria de Archivos que conduce a la Ejecución Remota de Código en todas las versiones hasta la 5.1.8 inclusive. Esto se debe a una validación insuficiente de la extensión de archivo en la función do_image_upload() donde la entrada proporcionada por el usuario desde el parámetro POST acceptFileTypes se interpola directamente en una expresión regular utilizada para validar archivos cargados. Los atacantes pueden especificar extensiones ejecutables de PHP como .phtml, .phar, .php5 o .php7 para eludir la protección .htaccess del plugin que solo bloquea archivos .php específicamente. Además, en servidores basados en Nginx, la protección .htaccess es completamente ineficaz ya que Nginx no procesa archivos .htaccess. Esto hace posible que atacantes no autenticados (que pueden obtener un nonce de cualquier página pública que contenga un formulario) carguen archivos PHP ejecutables en el directorio de acceso público /wp-content/uploads/de_fb_uploads/ y logren la Ejecución Remota de Código accediendo al archivo cargado a través de HTTP. La vulnerabilidad fue parcialmente parcheada en la versión 5.1.3."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Divi Engine",
          "product": "Divi Form Builder",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0",
              "lessThanOrEqual": "5.1.8",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-07-02T15:00:00.754811Z",
          "id": "CVE-2026-5524",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-434"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://diviengine.com/divi-form-builder-changelog/",
      "source": "[email protected]"
    },
    {
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/9692deb2-2526-4983-8a13-93a382e230c8?source=cve",
      "source": "[email protected]"
    }
  ]
}