Sonic first heard about the breach when its credit-card processor detected unusual activity on customers’ payment cards.
Fast-food giant Sonic has disclosed a data breach potentially affecting millions of customers. The chain has nearly 3,600 stores across 45 US states but as the investigation is ongoing, it does not yet know how many store payment systems were affected.
KrebsOnSecurity first reported the breach, which Sonic discovered last week when its credit-card processor informed the chain of unusual activity regarding customers’ payment cards.
