PIN Data May Have Been Stolen During Massive Security Breach at Target

Millions of Americans who use debit cards are finding out they may have even more to worry about.
3:00 | 12/28/13

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Transcript for PIN Data May Have Been Stolen During Massive Security Breach at Target
Now to the growing problems for customers who had their credit card information stolen while shopping at target. Malcolm's work hackers got their pin numbers to win at least one customer is now pleading with his bank for help after he says his bank account was cleaned out. Here's ABC's -- denied it. It was a Thanksgiving weekend purchased at target that Berkeley simply never expected would wiped out his entire bank account. -- realists among -- in court -- I for a Rico purchase -- -- days before Christmas to unexpected withdrawals totaling almost 350. Dollars. Charges he says he never made -- believes his card is one of the forty million breach between November 27 and December 15. Now target technology pin numbers were among the financial information stolen from their systems. Target needs to make sure that -- however they were able to obtain this data from their assistant from their servers cannot happen again. Here's my target -- your hands are still safe when a customer enters their -- that -- is encrypted at the keypad. It's supposed to be highly secure target says the -- his only decrypt did. By an independent payment process -- target says quote. The -- necessary to decrypt that data has never existed within target system and could not have been taken during this incident. But hackers may still be trying to access pin information once I think -- that -- that -- that everybody's. Credit card accounts. And bank accounts is potentially vulnerable to being used. As -- -- he lives in North Carolina and says the fraudulent charges were made at ATM's near Chicago's O'Hare airport the expert we spoke with warns more people may soon see fraudulent charges. I think the situation is gonna get a lot worse before gets any better. Target tells us customers should go to their website www. Corporate dot target. Dot com. Blankley said his bank couldn't confirm the source of the breach and any plans to file a police report Monday his bank already taking action David that closed his account its part to thank you.

This transcript has been automatically generated and may not be 100% accurate.

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