KLA10611
Multiple vulnerabilities in Microsoft Exchange Server

Multiple serious vulnerabilities have been found in Microsoft Exchange Server. Malicious users can exploit these vulnerabilities to gain privileges or spoof user interface.

Below is a complete list of vulnerabilities

1. An improper tokens validation can be exploited remotely via an unspecified vectors;
2. XSS vulnerability can be exploited remotely via a specially designed URL.

Microsoft Exchange Server 2007 Service Pack 3 
Microsoft Exchange Server 2010 Service Pack 3 
Microsoft Exchange Server 2013 Service Pack 1
Microsoft Exchange Server 2013 Cumulative Update 6 

Install necessary updates from the KB section, that are listed in your Windows Update (Windows Update usually can be accessed from the Control Panel)