The good news for the financial services industry is that the massive data breach Yahoo revealed Thursday didn't compromise any bank account or payment card data, according to the company.

The bad news is that the names, email addresses, phone numbers, dates of birth, hashed passwords and, in some cases, encrypted and unencrypted security questions and answers of 500 million Yahoo users — some large percentage of them bank customers — were stolen in late 2014. If it hasn't been already, that information could be used to harm banks and their customers.

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