Amazing. So you are now saying that everyone is at risk that is running v. 13
That is not what James said. He said that your issue was more than likely a Joomla issue and the best place for answers would be in the security forum. There are a lot of steps people can take to prevent hacking and the fact is that most don't do them. I myself had a site hacked last week because I failed to take a simple precaution. I think reading the security forum and getting help there is the best solution.
I would also like to hear why you think it was the template.