XSS vulnerable app 000-g
Sep 25, 2019 Update: Aug 28, 2021
Only br is supported in this app for security reasons.
HTML
CSS
JavaScript
<center>
<input type="text" id="input"/>
<div id="screen"></div>
</center>
document.querySelector('#input').addEventListener('keyup', function(e) {
if (e.keyCode === 13) {
let tagString = document.querySelector('#input').value;
// allow only `b`, `i`, and `br`
tagString = tagString.replace(/<(?!\s*br\s*\/?)[^>]+>/gi, '');
const range = document.createRange();
range.selectNode(document.getElementsByClassName('applet').item(0));
const documentFragment = range.createContextualFragment(tagString);
document.querySelector('#screen').appendChild(documentFragment);
}
});
#input {
font-size: 16px;
height: 26px;
width: 100%;
margin-bottom: 10px;
padding: 20px;
}
.applet-html {
padding: 20px;
}
.applet {
margin-bottom: 20px;
}Takeaways and notes#
- Hack this app to win 17.52 Ugandan dollars
- DM your bank account details including password and mother's maiden name to @hacksparrow