If it is a Bosch then the normal door seal snagged or split.
Hole in sump hose etc.
Pretty good lower panel to have a nose through.
(Ive had a number of them where water leaks down the front from the door seal & manages to trickle through the access panel, then activating the float.)
It is a BSH machine, spot on diagnosis Tim, I took the lower plinth off and it was wet all along the top edge so it can only be coming from the door seal or soap drawer.