Cross-site scripting (XSS) vulnerability in clickdesk.php in ClickDesk Live Support - Live Chat plugin 2.0 for WordPress allows remote attackers to inject arbitrary web script or HTML via the cdwidgetid parameter. NOTE: some of these details are obtained from third party information.
https://exchange.xforce.ibmcloud.com/vulnerabilities/71469
http://www.securityfocus.com/archive/1/520624/100/0/threaded
http://wordpress.org/extend/plugins/clickdesk-live-support-chat-plugin/changelog/