You may not recognize the name Magecart, but you’ve seen its impact. A set of sophisticated hacking groups, Magecart has been behind some of the bigger hacks of the past few years, from British Airways to Ticketmaster, all with the singular goal of stealing credit card numbers. Think of them as the ATM skimmers of the web. And thanks to poor security hygiene, they’ve managed to hit 17,000 domains in the past few months alone.

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