Microsoft Exchange Information Disclosure Vulnerability
An information disclosure vulnerability exists in how Microsoft Exchange validates tokens when handling certain messages. An attacker who successfully exploited the vulnerability could use this to gain further information from a user. To exploit the vulnerability, an attacker could include specially crafted OWA messages that could be loaded, without warning or filtering, from the attacker-controlled URL. This callback vector provides an information disclosure tactic used in web beacons and other types of tracking systems. The security update corrects the way that Exchange handles these token validations.
Microsoft Exchange Server 2013 Cumulative Update 23,Microsoft Exchange Server 2016 Cumulative Update 18,Microsoft Exchange Server 2019 Cumulative Update 6,Microsoft Exchange Server 2019 Cumulative Update 7,Microsoft Exchange Server 2016 Cumulative Update 17