Does water leak right after you turn it on, or does it accumulate under the machine gradually during the wash cycle?
If the puddle is small and only appears after the water drains - it's likely a problem with the gasket on the drain hose or where it connects. That's the least serious issue. Check if it's screwed on tight and whether there are any cracks in the hose itself. If the hose is fine, you might need to replace the rubber gasket - that's dirt cheap.
But if water is leaking actively during the wash cycle, especially at the start - it's most likely the door seal, the drum seal or the drum bearing. The seal can wear out over five years, but usually it leaks from the side, not the bottom. A leak from the bottom more often points to problems with the drum itself, its mounting, or the shock absorbers. You shouldn't keep using it - you could damage your floors or flood your neighbors. Find a technician; it's risky to mess with it yourself because you need to take apart the front of the machine.
Before the technician arrives, put towels or a tray under the machine so the water doesn't spread across the floor.