Dunkin' is notifying certain DD Perks account holders that their accounts may have been compromised. In a statement, Dunkin' Brands said they were notified by one of their security vendors that an outside source might have obtained DD Perks account holders' usernames and passwords through other companies or organizations' security breaches. The company said its internal systems "did not experience a data security breach." Dunkin' said it learned of the issue on Oct. 31.