Exchange 2019, 2016 and 2013 Security Updates for October 2020

Security updates have been released for Exchange 2013, Exchange 2016 and Exchange 2019.

CVE-2020-16969: 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.

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