AWS Bucket Takeover to Stored XSS: https://hackerone.com/reports/2262939

https://hackerone.com/reports/1598347

Other:

https://hackerone.com/reports/1835133

https://hackerone.com/reports/1791558

https://hackerone.com/reports/1397826

https://hackerone.com/reports/1777077