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CVE-2021-29434

Estado: ModificadaMedia (4.8)—

Wagtail is a Django content management system. In affected versions of Wagtail, when saving the contents of a rich text field in the admin interface, Wagtail does not apply server-side checks to ensure that link URLs use a valid protocol. A malicious user with access to the admin interface could thus craft a POST request to publish content with `javascript:` URLs containing arbitrary code. The vulnerability is not exploitable by an ordinary site visitor without access to the Wagtail admin. See referenced GitHub advisory for additional details, including a workaround. Patched versions have been released as Wagtail 2.11.7 (for the LTS 2.11 branch) and Wagtail 2.12.4 (for the current 2.12 branch).

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Torchbox — Wagtail

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-29434",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "baseScore": 3.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:S/C:N/I:P/A:N",
          "authentication": "SINGLE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
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        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
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          "version": "3.1",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
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          "privilegesRequired": "HIGH",
          "confidentialityImpact": "HIGH"
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        "impactScore": 5.2,
        "exploitabilityScore": 0.9
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  "published": "2021-04-19T19:15:17.610",
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      "url": "https://github.com/wagtail/wagtail/security/advisories/GHSA-wq5h-f9p5-q7fx",
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Wagtail is a Django content management system. In affected versions of Wagtail, when saving the contents of a rich text field in the admin interface, Wagtail does not apply server-side checks to ensure that link URLs use a valid protocol. A malicious user with access to the admin interface could thus craft a POST request to publish content with `javascript:` URLs containing arbitrary code. The vulnerability is not exploitable by an ordinary site visitor without access to the Wagtail admin. See referenced GitHub advisory for additional details, including a workaround. Patched versions have been released as Wagtail 2.11.7 (for the LTS 2.11 branch) and Wagtail 2.12.4 (for the current 2.12 branch)."
    },
    {
      "lang": "es",
      "value": "Wagtail es un sistema de gestión de contenido de Django.&#xa0;En las versiones afectadas de Wagtail, al guardar el contenido de un campo de texto enriquecido en la interfaz de administración, Wagtail no aplica comprobaciones del lado del servidor para garantizar a las URL de los enlaces usar un protocolo válido.&#xa0;Un usuario malicioso con acceso a la interfaz de administración podría entonces diseñar una petición POST para publicar contenido con URLs \"javascript:\" que contengan código arbitrario.&#xa0;La vulnerabilidad no es explotable por un visitante ordinario del sitio sin acceso al administrador de Wagtail.&#xa0;Véase el aviso de GitHub al que se hace referencia para obtener detalles adicionales, incluyendo una solución alternativa.&#xa0;Las versiones parcheadas ha sido lanzadas como Wagtail versión 2.11.7 (para la rama LTS 2.11) y Wagtail versión 2.12.4 (para la rama 2.12 actual)"
    }
  ],
  "lastModified": "2026-06-17T03:47:38.060",
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