Based on its investigation, Staples believes that malware may have allowed access to some transaction data at affected stores, including cardholder names, payment card numbers, expiration dates, and card verification codes. At 113 stores, the malware may have allowed access to this data for purchases made from August 10, 2014 through September 16, 2014. At two stores, the malware may have allowed access to data from purchases made from July 20, 2014 through September 16, 2014."
Staples is offering anyone affected a free year of identity theft protection including credit monitoring and identify theft insurance.
Source:
Staples