We currently have 2 issues in current AEM 6.3 SP1 setup. Below are the issue details based on the impact.
For both of these issues, solution from Adobe is to upgrade AEM 6.3 SP1 to SP2. Since SP3 + CFP1 is available can I directly
You should be able to directly installed sp3 but make sure to take backup of instance and clean uninstall is not supported