Within this version we made some significant improvements against XSS attacks. So as always we recommend you to update to this version as soon as possible.
We recommend you to read our announcements for version 4.1 if you have not done before.
A full list of all new features and bugfixes can be found in our issue tracker for version 4.1 and 4.1.4!
If you are new to Admidio and want to install it on your webpage than the following wikipage could help: Install Admidio
The following wiki pages maybe interesting on an Update: Update Admidio