> 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).

# DOM XSS con innerHTML y location.search

### XSS en el DOM en el sumidero InnerHTML usando la fuente location.search

Vulnerabilidad de XSS en el DOM 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 que JavaScript se inyecte y se ejecute cuando el valor proviene de la URL.

<figure><img src="/files/e04e50ef429af0eaaeb4abd30c9f8457436721c8" alt=""><figcaption></figcaption></figure>

**Extracto del 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): / `<script>alert("XSS")</script>`
* Prueba para insertar un elemento de imagen:/ `<img src="test"</img>`/ (esto no activa la ejecución de scripts ya que no está presente ningún atributo de evento)

<figure><img src="/files/de16376d9b8d0910e80785e29f605e4f9517d18e" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/87a562115188699eae12e29d913ccb94acdb290e" alt=""><figcaption></figcaption></figure>

Forzar un error de carga para activar un `onerror` controlador:/ `<img src=0 onerror=alert("XSS")>` / (Esta carga útil usa el `onerror` atributo de evento para ejecutar `alerta` cuando falla la carga de la imagen)

```javascript
<img src=0 onerror=alert("xss")>
```

<figure><img src="/files/4fd21e0f806e41be36a5da49c67920504f6746cf" alt=""><figcaption></figcaption></figure>

El script afecta directamente al `innerHTML` con la `búsqueda` valor de la URL; por lo tanto, fragmentos HTML que contienen controladores de eventos (p. ej. `onerror`) o etiquetas ejecutables pueden llevar a la ejecución de código. La `<img src=0 onerror=alert("XSS")>` carga útil provoca un error de carga y ejecuta `alert("XSS")`, lo que demuestra la vulnerabilidad de XSS en el DOM.


---

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