TransUnion, a major credit bureau in the U.S. that produces credit scores and reports, recently experienced a data breach impacting more than 4.4 million customers.

TransUnion reported the breach, which occurred on July 28, in a filing with Maine's attorney general's office on Thursday. The filing showed that customer data stored in "a third-party application" was compromised on that date. TransUnion discovered the breach two days later and reassured customers that the hackers did not access any credit information, including credit reports.

"Upon discovery, we quickly contained the issue, which did not involve our core credit database or include credit reports," a TransUnion spokesperson told Bloomberg in an email.

TransUnion informed the 16,828 Maine residents who were impacted

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