McDonald's was concerned that the hacker might use the details to conduct phishing scams. Phishing scams are fraudulent email campaigns run by criminals to steal financial and identity information, or infect users computers with malware.
"In the event that you are contacted by someone claiming to be from McDonald's asking for personal or financial information, do not respond and instead immediately contact us... McDonald's would not ask for that type of information online or through e-mail," the company wrote on its website.
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