Admidio is an open-source user management solution. Prior to version 5.0.10, "modules/documents-files.php" gates state-changing modes by checking that the actor has "hasUploadRight()" on the URL parameter "folder_uuid". The "move_save" handler then operates on a separate URL parameter "file_uuid" and calls "File::moveToFolder($destFolderUUID)". "File::moveToFolder()" checks the upload right on the destination folder but never on the source folder containing the file. As a result, any user who can upload to any single folder can move any file from any other folder — including private folders to which they have no view rights — into a folder they control, and then download it. Confidentiality is broken (private file contents leak) and integrity is broken (the file is removed from the original location). Version 5.0.10 contains a fix.