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Most scripts that are not custom written are potential ticking time bombs, be it Wordpress, Joomla, Drupal or any other system running in obsolete version. There's still a huge amount of online stores running on outdated versions of Joomla and Virtuemart, which are vulnerable for attacks.
With updating to newer versions, there are two problems that are both costly and time consuming to be solved. First of all, many extensions are not written properly, utilize hacks and exploit bugs specific to a single subversion of a script. Secondly, in many cases some features and functions can not be achieved by templating system and that's when some core CMS files are being changed and tweaked, making the system hard to update without breaking its functionality...
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