An elevation of privilege vulnerability exists in Microsoft Exchange Server. An attacker who successfully exploited this vulnerability could gain the same rights as a Domain Administrator.
Exploitation of this vulnerability requires Exchange Web Services (EWS) and Push Notifications to be enabled and in use in an affected environment. To exploit the vulnerability, an attacker would need to execute a man-in-the-middle attack to forward an authentication request to a Microsoft Active Directory domain controller, thereby facilitating gaining of increased privileges on the domain controller.
To address this vulnerability, Microsoft has evaluated the rights granted to Exchange Servers and Exchange Administrators in the identified scenarios and determined changes are possible which lower the permissions granted within an Active Directory domain. The actual permission changes will vary based upon the version of Exchange Server in use. Please see 4490059 for more information.
## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 26 | | [KB4487052](https://patchblox.com/security/data/fix/microsoft/kb4487052.md) | Feb 12, 2019 | | Microsoft | Microsoft Exchange Server 2013 Cumulative Update 22 | | [KB4345836](https://patchblox.com/security/data/fix/microsoft/kb4345836.md) | Feb 12, 2019 | | Microsoft | Microsoft Exchange Server 2016 Cumulative Update 12 | | [KB4471392](https://patchblox.com/security/data/fix/microsoft/kb4471392.md) | Feb 12, 2019 | | Microsoft | Microsoft Exchange Server 2019 Cumulative Update 1 | | [KB4471391](https://patchblox.com/security/data/fix/microsoft/kb4471391.md) | Feb 12, 2019 | --- Data as of 2026-11-07T18:46:35Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.