{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "WPForms Pro",
          "vendor": "WPForms",
          "versions": [
            {
              "lessThanOrEqual": "2.0.0.2",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "security@wordfence.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The WPForms Pro plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Single Line Text and Paragraph Text Field Values in all versions up to, and including, 2.0.0.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The exploit relies on the plugin\u0027s own wp_kses_allowed_html filter widening the \u0027post\u0027 allowlist to permit iframe elements with a data-src attribute, which is not on WordPress\u0027s URI-attribute sanitization list, allowing a javascript: URI stored in data-src to survive kses processing and subsequently be promoted to a live src attribute by the bundled admin script view-entry.min.js."
    },
    {
      "lang": "es",
      "value": "El plugin WPForms Pro para WordPress es vulnerable a cross-site scripting almacenado a trav\u00e9s de los valores de los campos de texto de una sola l\u00ednea y de p\u00e1rrafo en todas las versiones hasta la 2.0.0.2, inclusive, debido a una sanitizaci\u00f3n de entrada y un escape de salida insuficientes. Esto hace posible que atacantes no autenticados inyecten scripts web arbitrarios en p\u00e1ginas que se ejecutar\u00e1n cada vez que un usuario acceda a una p\u00e1gina inyectada. El exploit se basa en el propio filtro wp_kses_allowed_html del plugin, que ampl\u00eda la lista de permitidos \u0027post\u0027 para permitir elementos iframe con un atributo data-src, el cual no est\u00e1 en la lista de sanitizaci\u00f3n de atributos URI de WordPress, permitiendo que un URI javascript: almacenado en data-src sobreviva al procesamiento de kses y posteriormente sea promovido a un atributo src activo por el script de administraci\u00f3n incluido view-entry.min.js."
    }
  ],
  "id": "CVE-2026-18409",
  "lastModified": "2026-10-18T20:10:00.110",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.2,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 2.7,
        "source": "security@wordfence.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-18409",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-21T15:24:10.311364Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-21T04:18:01.380",
  "references": [
    {
      "source": "security@wordfence.com",
      "url": "https://wpforms.com/docs/how-to-view-recent-changes-to-the-wpforms-plugin-changelog/#Changelog"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/f26cbc41-8ed9-4dc6-a8bc-9986ecab5e6e?source=cve"
    }
  ],
  "sourceIdentifier": "security@wordfence.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "security@wordfence.com",
      "type": "Secondary"
    }
  ]
}