{
  "id": "CVE-2021-29460",
  "sourceIdentifier": "security-advisories@github.com",
  "published": "2021-04-27T20:15:08.860",
  "lastModified": "2021-05-07T22:46:27.260",
  "vulnStatus": "Analyzed",
  "descriptions": [
    {
      "lang": "en",
      "value": "Kirby is an open source CMS. An editor with write access to the Kirby Panel can upload an SVG file that contains harmful content like `<script>` tags. The direct link to that file can be sent to other users or visitors of the site. If the victim opens that link in a browser where they are logged in to Kirby, the script will run and can for example trigger requests to Kirby's API with the permissions of the victim. This vulnerability is critical if you might have potential attackers in your group of authenticated Panel users, as they can escalate their privileges if they get access to the Panel session of an admin user. Depending on your site, other JavaScript-powered attacks are possible. Visitors without Panel access can only use this attack vector if your site allows SVG file uploads in frontend forms and you don't already sanitize uploaded SVG files. The problem has been patched in Kirby 3.5.4. Please update to this or a later version to fix the vulnerability. Frontend upload forms need to be patched separately depending on how they store the uploaded file(s). If you use `File::create()`, you are protected by updating to 3.5.4+. As a work around you can disable the upload of SVG files in your file blueprints."
    },
    {
      "lang": "es",
      "value": "Kirby es un CMS de c\u00f3digo abierto.&#xa0;Un editor con acceso de escritura al Kirby Panel puede cargar un archivo SVG que contenga contenido da\u00f1ino como etiquetas \"(script)\".&#xa0;El enlace directo a ese archivo puede ser enviado a otros usuarios o visitantes al sitio.&#xa0;Si la v\u00edctima abre ese enlace en un navegador donde ha iniciado sesi\u00f3n en Kirby, el script se ejecutar\u00e1 y puede, por ejemplo, desencadenar peticiones a la API de Kirby con los permisos de la v\u00edctima.&#xa0;Esta vulnerabilidad es cr\u00edtica si puede tener atacantes potenciales en su grupo de usuarios autenticados del Panel, ya que pueden escalar sus privilegios si consiguen acceso a la sesi\u00f3n del Panel de un usuario administrador.&#xa0;Dependiendo de su sitio, son posibles otros ataques basados ??en JavaScript.&#xa0;Los visitantes sin acceso al Panel solo pueden usar este vector de ataque si su sitio permite la carga de archivos SVG en formularios de frontend y usted no&#xa0;sanea los archivos SVG cargados.&#xa0;El problema ha sido parcheado en Kirby versi\u00f3n 3.5.4.&#xa0;Actualice a esta o una versi\u00f3n posterior para corregir la vulnerabilidad.&#xa0;Los formularios de carga de frontend deben parchearse por separado dependiendo de c\u00f3mo almacenan los archivos cargados.&#xa0;Si usa la funci\u00f3n \"File::create()\", est\u00e1 protegido actualizando a 3.5.4+.&#xa0;Como soluci\u00f3n alternativa, puede desencadenar la carga de archivos SVG en sus planos de archivo"
    }
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      "url": "http://packetstormsecurity.com/files/162359/Kirby-CMS-3.5.3.1-Cross-Site-Scripting.html",
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