Hackers accessed the personal information of more than four million TransUnion customers in July, according to a regulatory disclosure from the major credit reporting agency.

TransUnion said in Thursday filings with Maine’s attorney general’s office that the data of 4.4 million customers that had been stored “on a third-party application” was compromised on July 28. The company said it discovered the breach two days later and that “no credit information was accessed.”

“Upon discovery, we quickly contained the issue, which did not involve our core credit database or include credit reports,” a TransUnion spokesperson, Jon Boughtin, said in an email. The company is working with law enforcement and has outside cybersecurity experts reviewing the breach, which Boughtin said “involved unauthor

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