Citi Prepaid Services notified the California Attorney General of a security incident caused by a code change to their prepaid cardholder website that impacted authentication security features between June 2 and June 13, 2013. The incident potentially exposed cardholder information, including prepaid card numbers and checking or savings account numbers. The company remediated the issue and offered one year of complimentary credit monitoring to affected cardholders. No unauthorized activity was confirmed.