I am an old user of this CMS, I had to use my own script made for my needs but I will love XOOPS all my life.
I've found 3 exploits (SQL Injections) for xoops, please do some patches!
http://www.milw0rm.com/exploits/3933
http://www.milw0rm.com/exploits/3932
http://www.milw0rm.com/exploits/3931