Microsoft has released security updates for Exchange Server 2013, Exchange Server 2016 and Exchange Server 2019 on January 10th 2023. These security updates closes two vulnerabilities. You should install these updates as soon as possible.
In Microsofts Tech Community article you will find useful informations how to update your Exchange Servers and how to implement Certificate Signing of PowerShell Serialization Payload.
Here are the Links to the latests security updates:
Exchange Server 2013 CU23: Link
Exchange Server 2016 CU23: Link
Exchange Server 2019 CU11: Link
Exchange Server 2019 CU12: Link
This is the supported update path:
After updating ALL of your on Premises Exchange Servers you can enable the Certificate Signing of PowerShell. Please follow the article below:
https://support.microsoft.com/en-us/topic/certificate-signing-of-powershell-serialization-payload-in-exchange-server-90fbf219-b0dd-4b2c-8a68-9d73b3309eb1
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