Cross-site scripting (XSS) vulnerability in vTiger CRM 5.4.0 allows remote attackers to inject arbitrary web script or HTML via the (1) return_url parameter to modules\com_vtiger_workflow\savetemplate.php, or unspecified vectors to (2) deletetask.php, (3) edittask.php, (4) savetask.php, or (5) saveworkflow.php.