Hi,
As far as I know there are no lists of hotfixes for Active Directory or Exchange 2016, you can find the list of all Windows Server 2016 cumulative updates over here:
Windows 10 and Windows Server 2016 update history
https://support.microsoft.com/en-us/help/4000825
For the cumulative updates list for Exchange Server 2016, see here:
Updates for Exchange Server
https://learn.microsoft.com/en-us/exchange/new-features/updates?view=exchserver-2016
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Best regards,
Leon