Data breaches have recently been announced by the healthcare navigation and care coordination company Quantum Health, Heart of America Medical Center, and Precision Imaging Centers.

Quantum Health, a Dublin, Ohio-based healthcare navigation and care coordination company that helps self-insured employers manage employee benefits and lower healthcare costs, has disclosed a cybersecurity incident that it identified in May 2026.

The incident started with a vishing attempt. The attacker called a Quantum Health user on May 29, 2026, and tricked them into providing access to the Quantum Health network. Between May 29, 2026, and June 1, 2026, the unauthorized third party had access to its network and acquired files. On June 1, 2026, Quantum Health experienced a network disruption affecting both internal and external systems. An investigation was launched, which traced the incident back to the vishing call. The threat group behind the incident was not named, and no ransomware group appears to have claimed responsibility for the attack. These tactics are commonly used by the ShinyHunters threat group, which was the subject of a recent Health-ISAC cybersecurity alert...