The massive data breach revealed this week could be even worse than initially feared, warns a cybersecurity expert.

Citing records discovered by security specialist Hold Security, The New York Times reported on Tuesday that a Russian crime ring has managed to gain access to more than a billion stolen Internet credentials. The stolen credentials include 1.2 billion password and username combinations and more than 500 million email addresses, according to Hold Security, which describes the breach as potentially the largest ever.

This, however, could be just the tip of the iceberg, according to Richard Martinez, a Minneapolis-based cybersecurity and privacy attorney with Robins, Kaplan, Miller & Ciresi. “The potential target zone of companies that are affected by this is much larger than the ones initially impacted by the breach,” he told FoxNews.com.

Martinez explained that, with many consumers re-using their passwords, hackers could potentially access data from even more companies and organizations. “As staggering as the scale of this is right now, it may well be much larger.”

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