Apple releases a major Security update for Mac OS X 10.3.9 and 10.4.2
On Aug. 15th, Apple released a major Security Update, 2005-007, affecting all latest Mac OS X versions: 10.3.9, both Server and Client, and Tiger 10.4.2, again both Server and Client.
Some early analysis reports that only few corrected flaws are critical and most should not affect most users.
Check here Apple Downloads and here the detailed information on this update.
Read here an article from News.com