There are published security advisories for the 3.5x releases and the latest release is 3.61. I would advise updating as quickly as possible as many of those security alerts also contain the method used to hack vB.
If hackers have been in on your server space you really need to go over it carefully to make sure you have erased any files they may have installed. There is not much point upgrading if hackers have left a backdoor into your server space.
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