> 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/reflected-xss-in-a-javascript-string-with-html-encoded-angle-brackets.md).
# XSS reflejado en una cadena JavaScript con signos de menor y mayor codificados en HTML
Notas de XSS reflejado en una cadena JavaScript con signos de menor y mayor codificados en HTML 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 una cadena de JavaScript con los signos de ángulo codificados en HTML
Este laboratorio contiene una vulnerabilidad de tipo XSS reflejada en el mecanismo de seguimiento de la consulta de búsqueda: los signos de ángulo (`<` y `>`) están codificados en HTML, pero el valor reflejado se inserta dentro de una \*\*cadena de JavaScript\*\*. El objetivo es salir de esta cadena de JS y llamar `alert()`.
**Extracto relevante del código observado**
{% code overflow="wrap" %}
```javascript
var searchTerms = 'hello';
document.write('');
```
{% endcode %}
El valor de búsqueda (`searchTerms`) se concatena en una `document.write` instrucción dentro de una cadena HTML construida con JavaScript. Al inyectar un apóstrofo (`'`) en el valor, puedes cerrar la cadena actual de JavaScript y ejecutar código arbitrario.
```javascript
hello'
```
Al enviar la siguiente cadena como valor de búsqueda, cierras la cadena, ejecutas `alert(0)` y luego cierras:
```javascript
hello' ; alert(0);'
```
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+'){kind=tracking}
');
```
{% endcode %}
