> 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-in-template-literal-with-escaped-unicode.md).

# XSS em um Template Literal com Caracteres Unicode Escapados

Notas sobre XSS em um Template Literal com Caracteres Unicode Escapados para laboratórios da PortSwigger Web Security Academy, incluindo fluxo de exploração, teste de payloads, validação no Burp Suite e contexto de remediação cont

### XSS refletido em um Template Literal com sinais de menor e maior, aspas simples, aspas duplas, barra invertida e backticks com escape Unicode

XSS refletido em um template literal (crases) onde `<` e `>` os sinais de menor e maior, assim como as aspas simples e duplas, são codificados, e a crase é escapada em Unicode. O objetivo: causar a execução de `alert()` dentro do template de string.

O parâmetro de pesquisa é refletido em um template literal de JavaScript. A string do template precisa ser quebrada para executar `alert()` a partir do valor refletido.

<pre class="language-javascript"><code class="lang-javascript">var message = `2 resultados de pesquisa para 'test'`;
<strong>document.getElementById('searchMessage').innerText = message;
</strong></code></pre>

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-9e01c413822a528e8f8d508cfceb5670682a6e59%2Fimage%20(416).png?alt=media" alt=""><figcaption></figcaption></figure>

* O caractere de crase (`` ` ``) delimita o literal de template; a página escapa a crase fornecida pelo usuário (por exemplo, usando escape Unicode), impedindo uma saída simples.

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-cd683beaa7d8cf19d1e69181029ae28e5e62a1e4%2Fimage%20(417).png?alt=media" alt=""><figcaption></figcaption></figure>

Exemplo de diferença de interpolação em JS (ilustração):

```javascript
variable = "Teste";
console.log("A variável é: ${variable}")
console.log(`A variável é: ${variable}`)
```

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-0c6d0eada5a823250cbb20521a0c5dffabd0b8aa%2Fimage%20(418).png?alt=media" alt=""><figcaption></figcaption></figure>

A primeira linha exibe literalmente `${variable}`, a segunda interpreta a variável com crases.

* Tentando inserir uma expressão de interpolação que executa `alert()`:

```javascript
${alert(0)}
```

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-ab6acd9b60a371feb6d804be4b5282f96fee3f97%2Fimage%20(419).png?alt=media" alt="" width="520"><figcaption></figcaption></figure>


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