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Someone should clarify if this
Contactless payments use the EMV protocol. Leaking the cc number is bad, but happens all the time. An actual payment athorisation replaces both PIN and signature. The victim's bank will argue that the victim authorised the transaction at the POS.
From what I've seen here the vulnerability exposes card number and expiration details. I don't know enough about NFC payment authorization to confidently confirm, but I'm not sure what other information would constitute an authorization
From @[email protected]:
If the PoS supports tokens, it'll use unique tokens for each payment. If the PoS doesn't support tokens, the phone has a virtual credit card number linked to the real one, so if it does get stolen, you can just remove the card from your Google Wallet to deactivate it. Your real card number is never exposed.
Even then, credit card numbers on their own aren't that useful anymore. Any online payment needs the CVC and PoS devices usually require chip or tap cards, which don't use the number. On top of that, credit card companies have purchase price restrictions when using swipe because of the security risks vs chip (which is why most PoS devices don't support swipe anymore).