Advantech WebAccess/VPN < 1.1.5 SQL Injection via AjaxStandaloneVpnClientsController.ajaxAction()

Advantech WebAccess/VPN versions prior to 1.1.5 contain a SQL injection vulnerability in AjaxStandaloneVpnClientsController.ajaxAction() that allows an authenticated low-privileged observer user to inject SQL via datatable search parameters, leading to disclosure of database information.