Embarcadero has releases a couple of small and focused patches for the recent RAD Studio, Delphi, and C++Builder 10.2.3 update.
The first is an Android Push Notification Patch available as https://cc.embarcadero.com/item/30831. This patch resolves an issue with push notifications on Android due to missing jar files. It fixes the publicly reported issue RSP-20137.
The second is fix for RAD Studio 10.2.3 RAD Server (EMS) Package Wizard Patch (and as such it is applicable only to Enterprise customers), available at https://cc.embarcadero.com/item/30832. In 10.2.2 a new RAD Server (EMS) project didn't have support for the Linux and the Win64 platforms by default. While adding it, the new wizard in 10.2.3 automatically adds the Linux target platform to both Delphi and C++Builder projects, even when not installed or not supported (C++Builder), and this causes the IDE to crash when using the wizard. In this case the readme has an incorrect reference to the issue addressed, as it lists the earlier bug resolved in 10.2.3, not the follow up problem addressed by the patch.