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Some days ago Microsoft released another SU Security Update for Exchange 2019 and 2016. See the original article from Exchange Team
The June 2023 SUs address vulnerabilities responsibly reported to Microsoft by security partners and found through Microsoft’s internal processes. Although we are not aware of any active exploits in the wild, our recommendation is to install these updates immediately to protect your environment.https://techcommunity.microsoft.com/t5/exchange-team-blog/released-june-2023-exchange-server-security-updates/ba-p/3845326
NOTE: Exchange 2016 of course is supported only the latest CU (23) because mainstream support already ended. Exchange 2019 only last two CUs are supported ( CU 12/13).
SUs are cumulative, so you can have installed January SU and can upgrade to the June Update in one step.
See the latest support matrix:
I can confirm, no issues after installing SU so far.
Please remember to use HealthChecker after installing SU.
Happy updating and good luck.