Not really a story, as any sort of internal leak in an airliner can be a problem. All the airliners I have worked on in recent years have measures to mitigate leaks from toilets/galleys or elsewhere.
These normally consist of extra barrier protection in the case of cabin floor areas under and around galley and toilet areas [liquid proof barrier coatings/coverings]
Specific overflow drains around galley areas that drain either to outside or into the grey water system.
Drip trays and drains in avionic bays above electronic equipment that drain away any leaks or excessive condensation