The good news? Follett appears to be on top of things. It has a patching system that should fix flaws in software up to a few versions back and can catch unofficial files that might be used to compromise the servers. The firm is also working with Talos to notify customers about the security risk. This doesn't guarantee smooth sailing from here on out (what about those with software too old to get those patches?), but there's a real chance that the issue will be contained before it gets completely out of hand.