The following April security updates for XP Embedded have been released and can be downloaded from here.
Below are a list of the components affected and links to the KB articles for more details on the functional and behavioral changes.
For SP1 and SP2:
Client/Sever Runtime (Console)
Win32 API - User
HTML Rendering Engine
Primitive: SxS * (SP1 only)
Windows Clean-Up Utilities * (SP1 only)
For SP1 only:
Message Queuing (MSMQ) for Active Directory Environment
Message Queuing (MSMQ) Core
Message Queuing (MSMQ) HTTP Support
Windows .Net Messenger