> 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/reflected-xss-in-html-with-blocked-tags.md).
# XSS Refletido em HTML com Tags Bloqueadas
### XSS refletido no contexto HTML com a maioria das tags e atributos bloqueados
Este laboratório contém uma vulnerabilidade de XSS refletido no recurso de pesquisa, mas um Firewall de Aplicação (WAF) bloqueia os vetores de XSS mais comuns. / Para resolver o laboratório, você deve contornar o WAF e acionar o `print()` função.
* Tentando payloads clássicos como `
test
`, `test
* Interceptei a página com o Burp Suite e iniciei um envio em massa via Intruder.
Copiei os tipos de atributos de evento (manipuladores de eventos) e testei vários deles na cheatsheet do PortSwigger.
* J
```
```
* Filtrei/testei vários atributos de eventos e me concentrei em `onresize`.
```javascript
```
Payload testado e operado:
* Injeção direta: `` — ao redimensionar (roda de zoom), o alerta aparece.
Objetivo final: chamar `print()` em vez de `alert()`:
```javascript
```
URL de exploração enviada à vítima:
```javascript
https://0a8500230379f8e980d8032300850075.web-security-academy.net/?search=
```
Entrega via iframe e acionamento automático:
* Para forçar o `onresize` evento a carregar no frame, a largura do frame é alterada a partir de seu `onload` atributo:
{% code overflow="wrap" %}
```javascript
```
{% endcode %}
Resumo: bypass do WAF injetando um atributo de evento permitido (`onresize`) que chama `print()`, depois entrega via iframe com `onload` que altera o tamanho para disparar `onresize`.
---
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