The compromise of data from over five million Saks Fifth Avenue and Lord & Taylor customers has raised concerns about the company’s information security capabilities and the fate of consumer data. It also reaffirms considerations for securing card readers amid increasing cybersecurity threats.

Announcing the compromise on April 1, cybersecurity researchers Gemini Advisory described the attack as “amongst the biggest and most damaging to hit retail companies” and estimated that the records were first compromised in May 2017. The group noted customer data was taken from 83 Saks locations, along with “the entire network of Lord & Taylor.” Most of the stolen card info was taken from locations in New Jersey and New York, with 125,000 records being sold on the dark web.