Mastercard is investigating two data breaches relating to a loyalty program it ran in Germany following a leak of personal information that saw customers’ names, addresses, and credit card numbers circulating on the internet.

A Mastercard spokesperson said the loyalty program, known as Priceless Specials and which was administered by a third-party firm, has been shut down since the company first became aware of the breach on Aug. 19.

Neil Hodge is a freelance business journalist and photographer based in Nottingham, United Kingdom. He writes on insurance and risk management, corporate governance, internal audit, compliance, and legal...