Lpanel 1.59 and earlier, and other versions before 1.597, allows remote authenticated users to modify certain critical variables and (1) modify DNS settings for arbitrary domains via the domain parameter to diagnose.php, (2) close, open, or respond to arbitrary support tickets via the close, open, or pid parameter to view_ticket.php, (3) obtain sensitive information on arbitrary invoices via the inv parameter to viewreceipt.php, or (4) modify domain information for arbitrary domains via the editdomain parameter to domains.php.