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Credit bureau TransUnion said Thursday that more than 4 million people’s data was exposed in a recent hack involving an unidentified third party.

In a letter dated earlier this week and posted to , the company said it had “recently experienced a cyber incident involving a third-party application serving our U.S. consumer support operations.”

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

Maine legally requires disclosures for certain kinds of breaches affecting its residents. The name of the third party application was not disclosed, but U.S. corporations have recently seen as hackers trick employees into opening up their respective employers’ Salesforce databases.

A Salesforce representative did not immediately return a message seeking comment.

Topics Cyber