A vulnerability classified as critical was found in DedeBIZ 6.3.0. This vulnerability affects the function get_mime_type of the file /admin/dialog/select_images_post.php of the component Attachment Settings. The manipulation of the argument upload leads to unrestricted upload. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.