Core component of SQL Server for storing, processing, and securing data
Confirmed - the same patching process as the one applicable to other SQL Server editions are applicable here as well. For more, refer to https://learn.microsoft.com/en-us/answers/questions/1324099/sql-server-express-service-pack-cumulative-update
If the above response helps answer your question, remember to "Accept Answer" so that others in the community facing similar issues can easily find the solution. Your contribution is highly appreciated.
hth
Marcin