Staples Breach Affects More Than 100 Retail Stores, a Million Credit Cards

Staples, Framingham, Mass., provided an update Friday—two months after its potential credit breach first was announced.

An investigation determined that malware was placed on some point-of-sale systems at 115 of its more that 1,400 U.S. retail stores. When detected in mid-September, Staples removed the threat and enhanced its security, including the use of new encryption tools and the hiring of data security experts to investigate the incident.