It is hard to tell from the picture, however it might be Celastrus orbiculatus. If it is, do everything possible to eliminate it. It spreads quickly, grows very fast and covers other vegetation, including trees. It forms an extremely dense overstory that blocks virtually all sunlight to the understory plant on which it is growing, including trees. I have attached a word doc with two pictures: one showing it growing and one showing the results. Hopefully it is Celastrus scandens and not Celastrus orbiculatus.