Seven-Eleven Japan said a platform run by a company it contracts to handle part of its 7NOW delivery service was hit by unauthorized access, and that some customer information leaked.
The leaked data covers more than 160,000 names of people who placed orders. Credit card information and passwords were not exposed, according to the company.
Seven-Eleven Japan said it has so far confirmed no cases of the stolen data being misused. The company did not say when the breach was detected or how many contractors were involved.
Data held by contractors
The disclosure puts a spotlight on the data that retailers hand to outside operators when they farm out delivery work. 7NOW is Seven-Eleven Japan's delivery service, and the company said only part of its operations are handled by the contractor whose platform was breached.
The company did not name the contractor, describe how the access occurred, or say whether the affected customers have been contacted.