Interesting that this only affects Visa and not Mastercard.
Computer Science researchers from Birmingham and Surrey Universities demonstrated to the BBC how the attack works by exploiting a weakness in the Visa contactless system through the use of a small piece of commercially available radio equipment, which is placed near the phone and masquerades as a ticket barrier.
Apple told the BBC the matter was an issue with the Visa system.
“We take any threat to users’ security very seriously,” said Apple. “This is a concern with a Visa system but Visa does not believe this kind of fraud is likely to take place in the real world given the multiple layers of security in place. In the unlikely event that an unauthorized payment does occur, Visa has made it clear that their cardholders are protected by Visa’s zero liability policy.”