You are reviewing a cloud storage locker application that is used to store and share user files and backups. You come across Cross-Site Scripting findings with data coming from several different…

You are reviewing a cloud storage locker application that is used to store and share user files and backups. You come across Cross-Site Scripting findings with data coming from several different sources. The customer you are working with is just getting started and is looking for highest priority issues only, so you need to focus on those issues that originate from the source that poses the highest risk. Which source poses the highest risk?