FREEZE CREDIT CARD: If there is any suspicion that credit card information may have has been leaked in a data breach, monitor your credit score for any changes, and consider freezing payments on credit cards to prevent unauthorized payments. "I would remove any saved or stored credit cards, bank accounts or payment methods that you may be using within the app ... because if that malicious actor is still in the environment, they're still looking around for data," said David Lindner, chief information security officer at Contrast Security.