SunTrust warns an ex-employee may have shared information on 1.5 million clients! The bank says the employee was not authorized to get that level of information, and that the company was reviewing its systems and capabilities.

"This is absolutely shocking," says WSB Consumer Expert Clark Howard. He says, "the fact that one person was able to gain access to that level of information and then sell it off is really shocking."

SunTrust believes the information included names and account balances, but not personally identifiable information such as social security numbers.

In a press release , the bank said it was proactively notifying the 1.5 million affected clients that certain information, such as address, phone number and certain account balances may have been exposed, and said it is working with outside experts and coordinating with law enforcement on the matter.

If you are a SunTrust customer Clark says make sure you freeze your credit and set up account alerts, where you are notified of transactions.