Welltok, Inc. notified UnitedHealthcare members in Delaware of a data breach involving the exploitation of a zero-day vulnerability in Progress Software's MOVEit Transfer tool. The incident occurred between May 30-31, 2023, resulting in the exfiltration of member data including names, addresses, Member IDs, DOBs, and Medicaid IDs. Welltok engaged third-party forensic specialists and is offering 24 months of credit monitoring via Experian.