While it's true that CBR is across the street from Epcot, it's across the street from the back of World Showcase, so it's not like you can just enter Epcot back there (and no, it's nowhere near the International Gateway, either).
If you were in Aruba 56, the CBR building closest to Epcot, you could walk across the parking lot and the access road, walk across the grass to the edge of the resort, cross Buena Vista Drive, walk across a field and a marsh, climb a chain-link fence with barbed wire on top, walk through the minefield and the alligator-infested swamp, scale a 20-foot wall, and then if the sharpshooters don't pick you off, you'll find youself backstage between Italy and Germany in World Showcase.