Stored XSS on www.hackerone.com due to deleted S3-bucket from old page_widget

I hope you all are good! Here's a funny little bug :) I tried making the most out of it and hope you'll like it.

<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
<meta name="robots" content="noindex, nofollow">
<title>Flipbook Widget</title></head>
<body style="margin:0; padding:0; background:transparent; overflow:hidden;"><div …