The Joomla CMS core is pretty secure right out of the box. Regretfully, there are a host of things that can make a Joomla website insecure.
Most Joomla CMS users seem a just a little afraid to harden their Joomla websites, often not really knowing what exactly to do.
If you want to know what you should do to help make sure that your Joomla website is secure then please take a look at the opensourcevarsity Joomla security tutorials.
These tutorials, guide you step by step how to make your Joomla website as secure as humanly possible