Microsoft Exchange Outlook Web Access (OWA) in Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 20 Microsoft Exchange Server 2013 Cumulative Update 18 Microsoft Exchange Server 2013 Cumulative Update 19 Microsoft Exchange Server 2013 Service Pack 1 Microsoft Exchange Server 2016 Cumulative Update 7 and Microsoft Exchange Server 2016 Cumulative Update 8 allows an elevation of privilege vulnerability due to how links in the body of an email message are rewritten aka \Microsoft Exchange Elevation of Privilege Vulnerability\.