Exchange Server Security Updates – November 2023
Microsoft released several SUs for Microsoft Exchange Server 2016, 2019 addressing found vulnerabilities in these products. Microsoft encourages customers to apply SU due to the critical nature of these vulnerabilities. Exchange Online customers are already protected from the vulnerabilities addressed by these SUs and do not need to take any action.
Microsoft has released Security Updates for vulnerabilities found in:
- Exchange Server 2016
- Exchange Server 2019
SUs are available for the following specific versions of Exchange Server:
Update installation
The following update paths are available:
By installing the November 2023 Security Update certificate signing of PowerShell serialization payload feature was introduced in January 2023, will be enabled by default.
IMPORTANT: Make sure that the Exchange Auth Certificate is valid before installing the Security Update. You can use the MonitorExchangeAuthCertificate.ps1 script to perform a quick check.
Microsoft Security Update Guide
