services/system_io/actionprocessor/Contact.rails in ConnectWise Manage 2017.5 allows arbitrary client-side JavaScript code execution (involving a ContactCommon field) on victims who click on a crafted link, aka XSS.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2017-3337
https://becomepentester.blogspot.in/2017/07/ConnectWise-Manage-XSS-CVE-2017-11727.html