> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/es/web/xss/dom-xss-with-innerhtml-and-location-search.md).
# XSS DOM con innerHTML y location.search
Notas de XSS DOM con innerHTML y location.search para laboratorios de PortSwigger Web Security Academy, incluido el flujo de explotación, pruebas de payloads, validación con Burp Suite y contexto de remediación.
### DOM XSS en el sumidero InnerHTML usando la fuente location.search
Vulnerabilidad DOM XSS en la función de búsqueda del blog. El código recupera el valor de `location.search` y lo inserta directamente en el DOM mediante `innerHTML`, lo que permite inyectar JavaScript y ejecutarlo cuando el valor proviene de la URL.
**Fragmento de código observado**
```javascript
function doSearchQuery(query) {
document.getElementById('searchMessage').innerHTML = query;
}
var query = (new URLSearchParams(window.location.search)).get('search');
if(query) {
doSearchQuery(query);
}
```
**Cargas útiles probadas**
* Carga útil simple (no interpretada): / ``
* Prueba para insertar un elemento de imagen:/ ``/ (esto no activa la ejecución de scripts ya que no hay ningún atributo de evento presente)
Forzar un error de carga para activar un `onerror` manejador:/ `` / (Esta carga útil usa el `onerror` atributo de evento para ejecutar `alerta` (cuando falla la carga de la imagen)
```javascript
```
El script afecta directamente `innerHTML` con la `parámetro de búsqueda` el valor de la URL; por lo tanto, fragmentos HTML que contengan controladores de eventos (p. ej., `onerror`) o etiquetas ejecutables pueden provocar la ejecución de código. El `` carga útil provoca un error de carga y ejecuta `alert("XSS")`, lo que demuestra la vulnerabilidad DOM XSS.
---
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