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nekro,
To the best of my knowledge, there have been no major member contributions that effect the 2.0.16 core. It is my understanding that 2.0.16 is the most up-to-date and secure version of XOOPS. There may be changes in SVN, but I'm not aware of anything effecting security, only functionality to be included in the next version of XOOPS.
Insanity can be defined as "doing the same thing over and over and expecting different results."
Stupidity is not a crime. Therefore, you are free to go.