National Public Data — the online background check and fraud prevention service targeted by hackers in what became one of the biggest social security breaches ever — is back. It may still pose a security threat.

In 2024, the private company announced a malicious actor had gained access to its systems in a Dec. 2023 breach, leaking information for several months to the web's black market. It took National Public Data even longer to disclose details of the breach to the public , which exposed nearly three decades of Social Security records — it was estimated that the hackers accessed hundreds of millions of records. Data included Social Security numbers, full names, addresses, emails, and phone numbers, prompting many to freeze their credit and go on the defense against identity theft.

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