"For an entire year, criminals were able to sit on the network of Lord & Taylor and Saks and steal data", he said. The company said it was investigating and taking steps to contain the attack. Customers would get free credit monitoring and other identity protection services once there was "more clarity around the facts", HBC said.
A "preliminary analysis" found credit card data was obtained for sales dating back to May 2017, according to the post.
The firm said the hacking syndicate which also goes by JokerStash has called the batch of stolen data, 'BIGBADABOOM-2'.
Saks Fifth Avenue, Saks OFF 5TH and Lord & Taylor were hit by a massive hack that exposed data on 5 million of debit and credit cards.
The breach comes at a hard time for Saks and Lord & Taylor, and retailers more generally.
'In addition, we identified three potentially compromised stores located in Ontario, Canada.
Hackers stole more than 130 million credit cards from credit-card processor Heartland Payment Systems, convenience store operator 7-Eleven Inc and grocer Hannaford Brothers Co, from 2006 to 2008, according to USA federal investigators.
Hudson's Bay said it's cooperating with law enforcement in an ongoing investigation.
The cybersecurity firm echoed that statement, saying, 'At this moment we believe that online shopping websites were not affected and online customers are not at risk'. The company says customers won't be liable for fraudulent charges.
The retail giant encouraged consumers to review their accounts and contact their card issuers if they recognize any unfamiliar transaction.
HBC said there has been no indication that Social Security or driver's license numbers have been affected by the data breach.
Hudson's Bay Co. says customer payment card information was involved in a "data security issue" at certain Saks Fifth Avenue, Saks OFF 5th and Lord & Taylor stores in North America.
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