Filters check
If you change the value of the filter ( inspect element chrome, and than change the value of the select box ) to "-1", you will get the mysql error what meanse bad validation of the incoming data...
Solution:
file: /usr/local/ispconfig/interface/lib/classes/listform.inc.php
Function: getPagingSQL
After code ( line ~197 ): if(!empty($_POST['search_limit']) AND $app->functions->intval($_POST['search_limit'])){ $_SESSION['search']['limit'] = $app->functions->intval($_POST['search_limit']); }
Add: if(preg_match('{^[0-9]$}',$_SESSION['search']['limit'])){ $_SESSION['search']['limit'] = 15; }