The seal/gasket is indeed replaceable. Look for part number 2-11232, 211232, or WP211232.
But from the looks of things, your machine has been spilling over the top of the tub for quite some time. Before removing that seal, it might be good to check that it isn't over-filling. It also would be a good idea to clean and scrub that upper tub cover, as there are drain holes that should direct splashes back into the tub, which are probably clogged.