Newark Term C to Term B
 

Is there a way to not have to go thru security again to transfer from incoming CO flight to get on Lufthansa in terminal B.

or only sky train and have to rescreen security?

I know there is a A to C bus, but have never flown anything but CO from EWR so never had to go into terminal B before...

My strong recollection is that you have to go outside of security. They do have an airside connection between Terminals A and C FWIW. Good luck!