Apple has released a security update for Mac OS X 10.3.6 Client/Server and 10.2.8 Client/Server. This brings changes on the follwing :

Mac OS X 10.3.6 Client
- Apache
- AppKit
- HIToolbox
- Kerberos
- Postfix
- PSNormalizer
- Safari
- Terminal

Mac OS X 10.3.6 Server
- client's changes
- new version of CyrusIMAP
- new version of QuickTime Streaming Server

Mac OS X 10.2.8 Client
- Apache
- AppKit
- Kerberos
- Safari

Mac OS X 10.2.8 Server
- client's changes
- new version of QuickTime Streaming Server

The update is available immediately through the Software Update preferences pane.

More information here.