5.39? Uff Da.
There's been many security fixes since 5.39.
Again, the security vulnerability described in the top of this thread is a tiny one. It allows moderators to read posts in forums they are not supposed to access. This should be the least of your worries.
If you are running 5.39, you have at least two vulnerabilities that allow a malicious user to gain admin access to your board or worse, and do some serious damage.
If you just can't upgrade, you should make frequent backups of your entire UBB.
Seriously consider upgrading to UBB6. It's much easier to modify, and is fully supported by Infopop. I doubt anyone here or at Infopop is going to be able to help with your 5.39 problems.
