This is usually indicative of soemthing blocking the flow of water out of the soap tray, down the connecting
pipe and in to the drum chamber.
The soap tray doesnt have any seals as water should just flow into the tray, wash out the soap / fabric softner, and then flow out the back of the tray and down the connecting pipe. When working correctly, there is no pressure or water back-up to cause the water to reach the front of the soap tray.
Take out the tray - your machine user manual will show you how, and check both the tray itself and the "hole" it slots in to for either a build up of solidified soap powder, or some other foreign object. If still leaking, remove the tray again and try to get your hand (a woman's or teenager's hand being smaller is best) down the large oulet at the back of the "hole" the tray slots in to to feel for a blockage.
Do you have young children ? A washing machine soap tray is a great place to hide things !
Occasionally, if the smaller pipes that deliver hot and cold water to the tray come adrift, this can spray water at the front of the machine. This water then has only one real way out - via the soap tray "hole". Most often this will be the cold water pipe as this has higher water pressure to cope with. The only way to check this is to take the top of the machine off.
If after all of the above it still leaks, you'll either need to dismantle the machine enough to see the back of the soap tray "hole", connecting pipe and drum chamber for a better look for problems, or call an engineer.