Nextcloud: http://www.nextcloud.com/wp-includes/js/swfupload/swfupload.swf allows open redirect / site defacement

Good day, I truly hope it treats you well on your side of the screen : I have found that your website uses the flash file: swfupload.swf to allow your users to upload files. The tl;dr version of this bug report is it allows an open redirect to any site a non kind person may want to exploit or...