TORONTO, July 20 (Reuters) - Half a dozen online photo printing stores based in the United States, UK and Canada, including those of Costco Wholesale Corp and Sam's Club , became in recent days the latest retailers to face a possible data breach at PNI Digital Media, which manages and/or hosts photo services sites.
Last week CVS Health Corp disabled its CVSphoto.com site, and the week before Walmart Canada's walmartphotocentre.ca took a similar action after it was informed that customer credit card data had been potentially compromised.
Other photo printing sites that might have been recently affected included Rite Aid Corp, Sam's Club and British supermarket chain Tesco's.
"We take the protection of information very seriously. PNI is investigating a potential credit card data issue, and outside security experts are assisting in the investigation," said Kirk Saville, vice president, global communications at Staples Inc , which bought Vancouver-based PNI last year.
Some websites said they had been advised by PNI of a potential breach, while others said they acted because of recent reports.
Costco Canada and Rite Aid noted that PNI has limited access to customer information since it does not process credit cards, but the photo service sites were temporarily taken down as a precaution.
CVS and Walmart Canada asked customers to monitor their credit card transactions closely for unauthorized charges.
Tesco's page simply said it was it was unavailable for routine maintenance.
The retailers' main websites and other services were not affected by the potential breach. (Reporting by Solarina Ho; Additional reporting by Nayan Das; Editing by Steve Orlofsky)