Cross-site scripting (XSS) vulnerability in scriptresx.ashx in Microsoft SharePoint Server 2010 Gold and SP1, SharePoint Foundation 2010 Gold and SP1, and Office Web Apps 2010 Gold and SP1 allows remote attackers to inject arbitrary web script or HTML via crafted JavaScript elements in a URL, aka "XSS scriptresx.ashx Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15589
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-050