Cross-site scripting (XSS) vulnerability in SharePoint Server in Microsoft SharePoint Foundation 2013 SP1 allows remote attackers to inject arbitrary web script or HTML via a crafted request, aka "Microsoft SharePoint XSS Vulnerability."
https://euvd.enisa.europa.eu/vulnerability/EUVD-2016-0077
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-015