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

# XSS en una plantilla literal con caracteres Unicode escapados

Notas de XSS en una plantilla literal con caracteres Unicode escapados 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 en un literal de plantilla con signos de menor y mayor, comillas simples, comillas dobles, barra invertida y comillas invertidas con escape Unicode

XSS reflejado en un literal de plantilla (comillas invertidas) donde `<` y `>` los signos de menor y mayor, así como las comillas simples y dobles, están codificados, y la comilla invertida está escapada en Unicode. El objetivo: provocar la ejecución de `alert()` dentro de la plantilla de cadenas.

El parámetro de búsqueda se refleja en una plantilla literal de JavaScript. La cadena de plantilla debe romperse para ejecutar `alert()` a partir del valor reflejado.

<pre class="language-javascript"><code class="lang-javascript">var message = `2 search results for 'test'`;
<strong>document.getElementById('searchMessage').innerText = message;
</strong></code></pre>

<figure><img src="https://754079710-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>

* El carácter de comilla invertida (`` ` ``) delimita el literal de plantilla; la página escapa la comilla invertida proporcionada por el usuario (por ejemplo, usando escape Unicode), lo que impide una ruptura simple.

<figure><img src="https://754079710-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>

Ejemplo de diferencia de interpolación en JS (ilustración):

```javascript
variable = "Testing";
console.log("La variable es: ${variable}")
console.log(`La variable es: ${variable}`)
```

<figure><img src="https://754079710-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>

La primera línea muestra literalmente `${variable}`, la segunda interpreta la variable con comillas invertidas.

* Intentando insertar una expresión de interpolación que ejecuta `alert()`:

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

<figure><img src="https://754079710-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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