> 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 de JavaScript con signos de menor que codificados en HTML
### XSS reflejado en una cadena de JavaScript con los corchetes angulares codificados en HTML
Este laboratorio contiene una vulnerabilidad de tipo XSS reflejada en el mecanismo de seguimiento de la consulta de búsqueda: los corchetes angulares (`<` y `>`) están codificados en HTML, pero el valor reflejado se inserta dentro de una \*\*cadena de JavaScript\*\*. El objetivo es salir de esta cadena JS y llamar `alert()`.
**Extrae lo 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 en JavaScript. Al inyectar una apóstrofe (`'`) en el valor, puedes cerrar la cadena de JavaScript actual 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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');
```
{% endcode %}