First of all, use the latest version of Joomla. How to upgrade Joomla to the newest version.
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Use the latest Joomla security update
All Joomla Security Info articles:
- Use the latest Joomla security update
- Use only secure third party plugins and keep them updated
- Use secure username and password for administrators
- Use an SEF component that makes your Joomla more secure
- Use a secure web host / secure server configuration
- Don’t tell everyone about your configuration
- Write-protect your Joomla configuration file (make unwriteable)
- Delete Joomla templates that you do not use
