A bug in Windows 10 allowed UWP apps (Universal Windows Platform) to have access to the entire file system in Windows without permission from the user. This could have allowed a malicious app to access any data stored on the computer without the knowledge or consent of the user. […]

from https://www.bleepingcomputer.com/news/security/windows-10-bug-allowed-uwp-apps-full-access-to-file-system/