The security breach, discovered Oct. 31, affects "DD Perks" customers, the company said.
"Although Dunkin' did not experience a data security breach involving its internal systems, we've been informed that third-parties obtained usernames and passwords through other companies' security breaches and used this information to log into some Dunkin' DD Perks accounts," the company said in a statement.
For more information and details on the breach, click here.
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