Joomla! is a great CMS that is used worldwide. For this reason, hackers often try to find a way to hack a Joomla! website. Here are 7 tips to optimize your Joomla! security, preventing your Joomla! website getting hacked.
Always remember to make a regular backup of your website and database. If you still get hacked, you can always get back to an older version of your website. Make sure you find out which extension caused the vulnerability and un-install it.
Change the default database prefix (jos_)
Most SQL injections that are written to hack a Joomla! website, try to retrieve data from the jos_users table. This way, they can retrieve the username and password from the super administrator of the website. Changing the default prefix into something random, will prevent (most / all) SQL injections.