Security expert Brian Krebs, who first called attention to the breach this morning, also noted that Walmart Canada discovered a similar breach in its online photo site last week.

Woonsocket-based CVS is notifying customers of its online photo printing service that they’ve detected a possible data breach.

PNI Digital Media, a Canadian company, is the vendor that runs the CVSPhotos.com site, said DeAngelis. PNI describes its services as a “proprietary transactional software platform”.

It’s not clear how many credit card numbers or what other information might have been compromised. We apologize for the inconvenience.

The company said in-store and CVS.com customers have not been affected. Target announced Monday, June 15, 2015, that it is selling its pharmacy and clinic businesses to drugstore chain CVS Health for about $1.9 billion in a deal that combines the resources of two retailers seeking to polish their reputations as health care providers.

The photo processing and digital photo business “are completely separate from CVS.com and our pharmacies”, customers were told.

“Customers who provided credit card information for transactions on CVSPhoto.com are advised to check their credit card statements for any fraudulent or suspicious activity and to call their bank or financial institution to report anything of concern”. We are working closely with the vendor and our financial partners and will share updates as we know more.