SimpleMachinesForum script has released an update to 1.1.8 which addresses some security and bug issues. Furthermore if you are one of those living on the bleeding edge, there is also an update to the latest Release Client 2.0 RC1-1.
The upgrade process from 1.1.8 to 1.1.9 was easier than expected and was a breeze compared to other forum software that I’ve used. Literally 2 clicks later the update was applied without any issues. To make sure you are using the latest version of the SMF forum software log into your admin panel and follow the prompts.
Like any other website script available, always stay up to date. There are plenty of nasty script kiddies that love to wreak havoc on online communities, no matter how popular they are.