# JavaScript Execution XS Leak
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```javascript
// Code that will try ${guess} as flag (need rest of the server code
app.get('/guessing', function(req, res) {
let guess = req.query.guess
let page = `
hello2
`
res.send(page)
});
```
Main page that generates iframes to the previous `/guessing` page to test each possibility
```html
hello
```
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* **Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/carlospolopm)**.**
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---
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