The chain said it was recently informed of the potential breach of its Photocentre website.
"We immediately launched an investigation and will be contacting customers who may be impacted," Walmart said. "At this time, we have no reason to believe that Walmart.ca, Walmart.com or in-store transactions are affected. "
The chain has immediately suspended the photo website and all mobile applications pending an investigation. The chains recommends that anyone concerned by the breach should monitor card transactions closely, and immediately alert the financial institution involved about any unauthorized charges.
The Globe and Mail, citing an unnamed source, says as many as 60,000 people could be impacted.