Yes, Sitefinity 5.0 supports claims-based authentication and single sign on.
Resources and documentation explaining how to set it up are available in this link
. Following the the way we implement SSO with Windows authentication you can implement authentication against your MVC based website.
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items