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.
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.