Cross-site scripting (XSS) vulnerability in the form method in modules/formclass.php in PivotX before 2.3.11 allows remote attackers to inject arbitrary web script or HTML via the PATH_INFO, related to the "PHP_SELF" variable and form actions.
http://www.securityfocus.com/bid/75577
http://www.securityfocus.com/archive/1/535860/100/0/threaded
http://blog.pivotx.net/archive/2015/06/21/pivotx-2311-released