Monzo discovers security flaw, asks some customers to change card numbers
https://www.reuters.com/article/us-monzo-tech/monzo-discovers-security-flaw-asks-some-customers-to-change-card-numbers-idUSKCN1UV1IR
British digital bank Monzo has asked around half a million of its customers to change their card PIN (personal identification number) after discovering a security flaw in its system.