Codemasters, and Eurogamer has the details on a security violation that compromised the company's website, EStore, CodeM database, and Dirt3 VIP code redemption webpage. The intrusion occurred on June 3rd, and Codemasters has sent out a letter to affected customers advising of the potential threat to their identity-related information.
The article reports that no payment details or credit card info was pilfered, but encrypted passwords as well as Xbox Live gamer tags and personal data (including addresses and user names) were taken. Thus far no groups or individuals have claimed responsibility for the attack. You can read the full Codemasters letter at Eurogamer.