Bluetooth-enabled POS Terminals + MagStripe-based Cards are a recipe for disaster. The weakest link is the enabled Bluetooth capability of the POS, which an attacker can attempt to remotely enter using a nested terminal command, which requires no authentication. Only the deliberate discontinuation of magstripe cards can stop the easily implementable exploit such as this one, but that requires the full cooperation of all banks and all of their customers. The transition from the Magstripe to chip-based cards introduces a weakness into the POS system, as it is easily be manipulated, let alone copied.”]
Source: https://hackercombat.com/recipe-for-disaster-bluetooth-enabled-pos-terminals-magstripe-based-cards/