HackerOne: Reflected File Download attack allows attacker to 'upload' executables to hackerone.com domain

Hi hackerone team, I'm a friend of Peiying and am looking for a position at hackerone. While playing around with your product, I found a serious vulnerability in your application: it allows attackers to craft executables on the hackerone.com domain rather than the sandboxed one on S3. 1. attacker...