Dear VB License Holder,
It has come to our attention that there may be a potential security vulnerability in VBSEO affecting the latest version of the software (and potentially other versions as well). We've attempted to contact the vendor, but as they have been non-responsive we felt we should alert the community as many of our customers use this add-on software.
If you think you might be running a vulnerable version of the software, there is a simple fix: just comment out the following lines in the file vbseo/includes/functions_vbseo_hook.php:
if(isset($_REQUEST['ajax']) && isset($_SERVER['HTTP_REFERER']))
$permalinkurl = $_SERVER['HTTP_REFERER'].$permalinkurl;
should be changed to:
// if(isset($_REQUEST['ajax']) &&...