Since it is about security it is imperative to mention here that the vulnerability was found by a KDE developer only (Maksim) and was patched without any delay.
www.kde.org/info/security/advisory-20060119-1.txt
Also even if this vulnerability was ever exploited by an attacker, he could've taken control of your system "only if" you used konqueror as your web browser and that too as root. Otherwise the maximum that the attacker could've done was do something bad to the user's account. Agreed that is not a small thing either, but just wanted to clarify this thing.
prakash kerala said:
I think this is the time KDE Users should @tleast try to move toGNOME DE or anyother lightweight WM/DE.
If you have reasons other than security then I am all ears but if you are talking about security then the following links might be of interest to you.
*secunia.com/product/219/
*secunia.com/product/3277/
GNOME 2.x with all vendor patches installed and all vendor workarounds applied, is currently affected by one or more Secunia advisories rated Moderately critical
KDE 3.x with all vendor patches installed and all vendor workarounds applied, is currently affected by one or more Secunia advisories rated Less critical
I am not saying that one product is better then another one. Just giving a view about security advisories, so please don't flame.