The credit reporting company TransUnion has confirmed that more than 4 million people’s data was exposed in a recent hack involving an unidentified third party.

In a letter posted to the website of Maine’s attorney general on Wednesday, the company said it had “recently experienced a cyber incident involving a third-party application serving our US consumer support operations”.

“We continue to enhance our security controls as appropriate to minimise the risk of any similar incident in the future.”

In a statement, TransUnion said it had “quickly contained the issue, which did not involve our core credit database or include credit reports”.

The Illinois-based credit bureau also issued a letter to consumers, saying it would offer its credit monitoring services to those affected free of ch

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