This topic came up the other day, which I have been trying to find for you, but I think you will find as part of the EU, the Blue Badge is valid in Greece/Corfu. You must park in allocated disabled parking zones, and I think parking charges are to be paid.
I will see if I can find the other thread for you which had a link to it.
PS: Found it for you. Read the second post in the thread from the link below. Hope this helps you.