The sites created by CSB are HTML with no active content created by CSB.
The pages are not a threat or a problem.
HOWEVER....As always, there are predators that look for ways to corrupt and distort your site/purpose.
You need to take precautions with anything you ADD to your site.
1) ANY script you add to your website pages must be up to date. For example, if you use INSERT HTML to add a nice javascript slideshow, it should be fine if it is not interactive. Javascript is not JAVA. Scripts from several sites (Dynamic Drive, Javascript kit, and many others) add fun interesting items to our sites. Some of these scripts are simple one or two lines of code and are not a threat to anyone and are not worth hacking since they do not have interactive properties. They passively do something without your visitor needing to choose or input anything.
Other scripts are HUGE and can be very interactive. This FORUM is a SCRIPT I run from Samisite.com. It must be maintained on a regular basis, patches applied to add security or other features. If you have any script of any size, consider if it is interactive and can be exploited and make sure it is updated regularly.
2) JAVA APPLETS. You will most likely not have these on your site. But if you do, be sure they are CURRENT! These often have the feel of flash, smooth animation, water effects, etc.
3) FLASH. Unfortunately this format is under constant attack. Do you need flash elements on your site? Apple products (safari browser) do not support it natively so Ipad, Iphone, etc do not like flash elements. If not necessary, consider swapping for other format.
4)
ANY FORM or interactive script that requires your visitor to input and send might be vulnerable to exploits!! This is usually the CSB user's largest concern. Do your best to be sure you are using a CURRENT and secure script. Nothing related to "Form Mail" family of scripts.
Take a look at this topic for more info about it. Using a form service often solves any worries here because the form script is maintained off your site.