The Joomla 1.5.18 patch has been released and in all cases all Joomla sites should be upgraded to the latest version. Making sure that your Joomla installation is up to date will ensure a high level of security on your website.
Please put in a request to have your site upgraded to the latest version of Joomla if it hasn’t been done already.
The latest update from Joomla has been released with a list of new patches and fixes to the Joomla core.