Cross-site request forgery (CSRF) vulnerability in the web applications in Microsoft Exchange Server 2013 SP1 and Cumulative Update 8 allows remote attackers to hijack the authentication of arbitrary users, aka "Exchange Cross-Site Request Forgery Vulnerability."
Cross-Site Request Forgery The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.