Delta Dental of California disclosed a data security incident involving the MOVEit file-transfer software. Unauthorized actors exploited a vulnerability in the software between May 27 and May 30, 2023. The company discovered the incident on June 1, 2023, and confirmed unauthorized access to personal information on July 6, 2023. Notifications to affected individuals began on November 27, 2023. The breach involved identity and government-issued data. The company engaged forensic experts, notified law enforcement, and offered 24 months of credit monitoring.