In CKSource CKFinder before 2.5.0.1 for ASP.NET, authenticated users could download any file from the server if the correct path to a file was provided.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2016-10801
https://download.cksource.com/CKFinder/CKFinder%20for%20ASP.NET/2.5.0.1/