The TransUnion data breach exposed the data of up to 4.4 million customers. CNET

Sensitive personal information belonging to 4.4 million customers, including their names and Social Security numbers, was exposed in a data breach on credit bureau TransUnion, in what is believed to be the latest in a string of attacks targeting companies' Salesforce databases.

The data breach, which occurred on July 28, was identified and contained within hours, a TransUnion spokesperson told CNET. TransUnion is one of three credit bureaus -- along with Equifax and Experian -- that compile your financial activity into credit reports that are then used to create your credit scores. The credit bureau said it's notifying people who may have been affected and sharing the actions the company is taking.

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