1715
Perhaps you could tell us what modifications you have made to the XOOPS core files. If you are concerned about someone capitalizing on a vulnerability, you could PM your mods to a XOOPS Dev.
IMHO, no CMS is 100% secure, but out the four sites I manage, not one of them is exibiting this problem. Of course, I haven't tampered with the XOOPS core files either. I'm willing to wager that your problem resides in your modifications, not Xoops.
However, unless you share the details of your mods with the XOOPS Devs and try the suggestion of using someone's mirror, there's not much else that can be done.
BTW... Shared hosting for a University?!? I attend college at WVU-P [pretty small campus] and even we have our own Web and DNS servers. If you're really concerned about security, shared hosting is not the most secure route to go. Talk to your Network Admin and see if they can set you up with a secure server. It only takes a little bit and it could be the solution to your problem. Just a suggestion.