Is postnuke 714 / 726 secure?

I've been a postnuke supporter for some time now, and have several client installations on my server. Some of these are pretty darn old, and I was wondering if these installs are secure or not.

Any ideas?

If they are insecure, what are my options as the admin (I know that I can upgrade them, just thinking things like mod security)

 

 

 

 

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