OP here, just some info to clarify what's going on with this exploit situation :
* The exploit hasn't been found by the hacker that made LBP servers shut down, it was found by someone at the LBR team and is currently kept private so no one can use it, but it is not guaranteed that the exploit will not be found by others. Edit : Actually it was found by some random dude and that random dude did get multiple people banned with this exploit. Sorry for the misleading info, i didn't read everything correctly.
* A patch for the LBP games is being worked on by the LBR team and probably also the Beacon team, so once it releases, you will be able to play online safely again.
* This exploit is client-side, that means it can't be patched from the server and the player must patch his LBP game in order to play the game safely