Leak from freezer into refridgerator, near the back.
You did not mention what Model and Make it is. That could change a fix.
Just a generic fix, assuming the unit its not too new, the first thing you want to do is turn the water off that is feeding your ice maker. Behind the refer on the wall. Be careful to not kink the water pipe pulling out and putting back the refer during your repair.
If stopping the leak into the refer was accomplished by turning off the water, now your confronted with how old is the refer and is it worth digging around and finding the actual leak. If the leak is in the wall of the refer (not the house wall), basically, just forget it, live with it and buy some ice trays. If you want the ice and it is really old, you may want to take this opportunity to replace the unit.
This would be my first assessment, not knowing age, make and model number. Sorry, wish I could be more helpful.