Although it is impossible to access another player's EZStorage system when it has a Security Box, and it's impossible to place blocks (such as ejection ports and chests) next to it, you can place these blocks using dispensers and they will work. With an ender chest and some item pipes, you can steal another player's entire system extremely quickly.
I imagine this would be hard to fix since it may not be easy to determine whether a block is placed by a dispenser, but ideally, only blocks placed by the storage system owner(s) should be compatible with that system at all.
Although it is impossible to access another player's EZStorage system when it has a Security Box, and it's impossible to place blocks (such as ejection ports and chests) next to it, you can place these blocks using dispensers and they will work. With an ender chest and some item pipes, you can steal another player's entire system extremely quickly. I imagine this would be hard to fix since it may not be easy to determine whether a block is placed by a dispenser, but ideally, only blocks placed by the storage system owner(s) should be compatible with that system at all.