On November 18, 2023, the Vermont Office of the Attorney General disclosed a data breach affecting Stanford Health Care’s group health plans. The incident stemmed from unauthorized access to a MOVEit Transfer server, discovered on August 11, 2023, though the breach itself occurred earlier on May 30, 2023. The attack exposed personal information of an unspecified number of individuals, including potentially sensitive health-related data tied to the group health plans. While the exact scope of compromised data (e.g., medical records, financial details, or identifiers) was not specified, the breach involved a third-party file transfer tool widely exploited in 2023 by cybercriminals. The delay in detection suggests a sophisticated intrusion, likely leveraging a zero-day vulnerability in MOVEit. As a healthcare provider, Stanford Health Care handles highly regulated data under HIPAA, making the exposure particularly critical. The breach underscores risks associated with third-party vendor vulnerabilities and the broader implications for patient trust and regulatory compliance.