I would see that article as just honest.
They admitted vulnerability, they admitted they made a mistake and then fixed it. It happens to us all.
I have used Joomla for some time and find it very easy to use and its client friendly as well!
The more popular a program is the more people want to attack it. Give it time and Drupal along with the other less known CMS software will suffer the same level of attack.
Alan (Neweb Ireland)
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The one thing we all have in common is that we are all different!