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You need to disable anon users from being able to create polls in the newbb2 admin area for the forum in question.
(where the group permissions are inside newbb admin, you will see create polls, uncheck it for everyone but webmasters).
I have yet to seriously investigate (as it's an RC) but my bet is that if you hit your site as ANON, and create a poll in the forum, it will create a poll, but when you try and view that poll it will appear with no questions or description.
Even while I am logged in as admin, every poll I create from inside the forum displays this behaviour. If I admin the polls module directly, I can see that the record was created (via create poll in newbb) without all data. While in the poll admin, I can add the missing data back to the poll and it will display correctly (at least in the polls module, have not tested to see if newbb2 will then display correctly as I just disabled polls in newbb until the next relelease).
I don't think there is so much a security issue, as something buggy in the poll functions (it has been noted that the poll section in newbb2 needs more work).
Try creating an anon poll via newbb and see if my predictions are correct. At least it should give you some peace of mind regarding newbb if nothing else.
The chat is a bit nasty though... see if it is calling the text sanitizer anywhere, if not you may be getting script injections.
GL