Windows 10 UWP app bug could steal your data without you knowing October 26, 2018 https://www.techradar.com/news/windows-10-uwp-app-bug-could-steal-your-data-without-you-knowing
Par for the course from that dizzy group. They seem to be trying to drown the hi tech revolution by releasing so much error instead of getting a better understanding of what they are supposed to be distributing in the way of some safety. As in cautiously and intelligently testing their code intensively before releasing, which isn't happening.
Well, but what if the legit app was exploited? It sounds this negates part of the purpose of AppContainer.
Typically it's going to be a bogus app placed in the store, rather than a legitimate app being exploited. It even implies that in the article.