Description
<p>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.</p> <p>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.</p> <p>The security update corrects the way that Exchange handles these token validations.</p>
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Microsoft Microsoft Exchange Server 2019 Cumulative Update 6
15.02.0 to < publicationaffected
Microsoft Microsoft Exchange Server 2016 Cumulative Update 17
15.01.0 to < publicationaffected
Microsoft Microsoft Exchange Server 2019 Cumulative Update 7
15.02.0 to < publicationaffected
Microsoft Microsoft Exchange Server 2016 Cumulative Update 18
15.01.0 to < publicationaffected
Microsoft Microsoft Exchange Server 2013 Cumulative Update 23
15.00.0 to < publicationaffected