Breach

Major Connecticut-based nonprofit healthcare network Yale New Haven Health has confirmed having data from more than 5.5 million individuals compromised following a network intrusion last month, making the incident the largest health data breach so far this year, The Register reports.

More than 91.3 million individuals across the U.S. have been impacted by data breaches during the first quarter of 2025, which is 26% higher than the same period last year, even though breach incidents slightly declined year-over-year, according to Infosecurity Magazine.

Kelly Benefits, a Maryland-based benefits administration and payroll solutions provider, has confirmed that almost 264,000 individuals served by its customers Amergis, CareFirst, Beam Benefits, Intercon Truck of Baltimore, Beltway Companies, The Guardian Life Insurance Company of America, Transforming Lives, and Publications Circulation Fulfilment had their data compromised following a cyberattack in December, SecurityWeek reports.

Officials at Baltimore City Public Schools have confirmed that over 1,150 students, as well as current and former employees, contractors, and volunteers, had their information stolen following a ransomware attack in February, according to The Record, a news site by cybersecurity firm Recorded Future.

SecurityWeek reports that Milwaukee-based ambulance service provider Bell Ambulance and Alabama-based ophthalmology practice Alabama Ophthalmology Associates have disclosed being impacted by separate ransomware attacks that cumulatively compromised data belonging to more than 200,000 individuals.

Leading South Korean telecommunications provider SK Telecom had some of its customers' USIM details leaked following the compromise of its systems, according to The Korea Times.