I think there are still 4.0 or 3.2 installations.
It depends to your requirements whether you stay with 4.0.
But it might help if you are able to upgrade to a newer version in case of problems.
The CMS is a full suite which jboss is a part of , as i dont have a lot of experiance i'm afriad this version is too old and inscure.
CMS, I don't know what it is exactly.
But 4.0.5 version might be old and did not include the latest bugfixes. But I think it is not unsecure in general for use.
I know the acronym CMS but what I mean is I do not know how it is implemented in your case.
I've seen deployments where JBoss is hidden for public use, is this case there is no security risk.
If you deploy it in a public way you should it configure propper to secure it and protect against DOS and other attacks.
If you test the 4.0 version with your application and deploment and it works I see no reason why you need improvements and fixes.
But keep in mind, the time will come where you need a new feature or a bugfix. But it is open source, you might fix the bug by your own
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Great thank you , this answers all i wanted to know.