Every user of the library before version 1.0.4.
Patched in 1.0.4+.
None.
https://github.com/SeppPenner/WindowsHello/issues/3
It this library is used to encrypt text and write the output to a txt file, another executable could be able to decrypt the text using the static method NCryptDecrypt from this same library without the need to use Windows Hello Authentication again.