Automattic: Stored Self XSS on https://app.crowdsignal.com (in Photo Insert App) + Stored XSS on https://*your-subdomain*.survey.fm

Steps: 1. Go to https://app.crowdsignal.com/dashboard and click Create a New Quiz 2. Add Multiple Choice to your page and click image button, upload a photo and click upload. 3. Start the burp suite and click Save button. Look at the request poc1.png and you will see mediacode= parameter. It will...