A July 4 Magecart card-skimming attack successfully infiltrated 962 online stores in what researchers are calling the largest 24-hour automated Magecart campaign to date.

Researchers from Sanguine Security Labs who detected the attack reported it via Twitter, and uploaded the JavaScript-based skimmer code to GitHub.

Sanguine Security researcher Willem de Groot told BleepingComputer that the campaign took place within a 24-hour timeframe. "It would be nearly impossible to breach 960+ stores manually in such a short time," he reportedly said, noting that some of the victims were vulnerable against PHP object injection exploits.

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