If this issue turns out to be an exploit it might be best to discuss it with the people that code Unreal rather than post the exploit or any details of the exploit here. Alot of business enterprises depend on the inegrity of software and if anyone was to 'give away' any details before the software authors had a chance to patch (if necessary) then such exploits could prove to be extremely damaging.
Having said that, if an exploit exists then it is not necessarily the fault of the authors. Bored/unemployed teenagers have endless hours on hand to use to stuff things up and experiment for the wrong reasons so such events are inevitable.
Remember that it's only really an exploit if it is abused, otherwise it is just harmless code.
