> 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-reflected-in-an-attribute-with-encoded-angle-brackets.md).

# XSS reflejado en un atributo con signos de menor que codificados

### XSS reflejado en un atributo con corchetes angulares codificados en HTML

Este laboratorio contiene una vulnerabilidad de XSS reflejada en la función de búsqueda del blog: el contenido proporcionado por el usuario se inyecta en el valor de un `valor` atributo de un `<input>`, y los `<` y `>` corchetes angulares están codificados en HTML (`&lt;`, `&gt;`). El objetivo es inyectar un nuevo atributo que active `alert()`.

<figure><img src="/files/50143c451a386adee91f51c86cb1229e2c18eec6" alt=""><figcaption></figcaption></figure>

#### Observaciones

* El texto introducido aparece en el `valor` atributo de la entrada.
* Intentar insertar `">test` es neutralizado al codificarse los corchetes angulares, por lo que no puedes abrir una nueva etiqueta de esta manera.

```
">test
```

<figure><img src="/files/83a2d751d1e7eda93947e0b381e684f4e2680219" alt=""><figcaption></figcaption></figure>

Sin embargo, dado que el valor va entre comillas, es posible cerrar el `valor` valor y añadir un nuevo atributo al mismo `<input>` elemento inyectando una secuencia que contenga una comilla de cierre.

```javascript
hola" test="hello
```

<figure><img src="/files/dd6a641188a18c49c355d249f41a864d24fdc7e1" alt=""><figcaption></figcaption></figure>

1. Cierra el `valor` valor con una comilla doble inyectada.
2. Añade un nuevo atributo de evento (p. ej., `onmouseover`) que contenga la llamada a `alert()`.

```javascript
test" onmouseover="alert(0)
```

<figure><img src="/files/434fd2d92329963f2277dba6261f90653e3f512f" alt=""><figcaption></figcaption></figure>

* La carga útil cierra el `valor` atributo y añade `onmouseover="alert(0)"` al `<input>` elemento.

<figure><img src="/files/33d96332a7d1623fc1755ca6db052d7a02394df2" alt=""><figcaption></figcaption></figure>


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