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McLaren Health Care confirmed it was hit by a ransomware attack that disrupted clinical and business operations across its Michigan network, forcing the organization to rely on downtime procedures and warning that recovery would extend into September. Follow-up reporting said McLaren was still restoring systems weeks later and had not yet determined whether patient or employee data had been accessed or stolen, leaving the scope of any data compromise unclear as the health system worked to bring affected services back online.
Ascension, one of the largest U.S. health systems, also suffered a major cyberattack that caused widespread outages, diverted ambulances, and disrupted electronic health records, phone systems, and other care operations; reporting at the time linked the incident to suspected Black Basta ransomware activity. Later disclosures said the attack resulted in a data breach affecting 5.6 million people, exposing personal, insurance, medical, and payment-related information and underscoring how ransomware incidents in healthcare can escalate from operational disruption to large-scale compromise of sensitive patient data.
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4 events from the most recent confirmed update back to the earliest known activity.
Ascension disclosed that the cyberattack earlier in the year resulted in a data breach affecting about 5.6 million individuals. This represented a major escalation from operational disruption to confirmed large-scale exposure of personal information.
McLaren reported it was recovering from the ransomware attack, but said it was still unclear whether patient or other data had been compromised. This marked a later update focused on restoration progress and unresolved questions about data security.
McLaren Health Care confirmed it had been hit by ransomware and said operational disruptions were expected to continue into September. The announcement established the incident as a ransomware event affecting the health system's operations.
Ascension disclosed a cyberattack that disrupted clinical operations across its healthcare network, forcing some hospitals to redirect ambulances. Contemporary reporting described the incident as a suspected Black Basta ransomware attack.
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Ransomware attacks have repeatedly crippled hospital operations, forcing providers to divert care, lose access to critical systems, and in some cases pay attackers to recover. At Hollywood Presbyterian Medical Center in Los Angeles, malware encrypted files and disrupted the hospital's computer network, prompting executives to pay about **$17,000 in bitcoin** after attackers reportedly reduced an initial demand of **$3.4 million**. The outage interfered with administrative functions and highlighted how cyberattacks on healthcare can create direct patient-safety risks. The threat later scaled across national healthcare systems. The **WannaCry** outbreak spread to nearly 100 countries and severely impacted the UK's **NHS**, knocking hospitals and clinics offline and disrupting appointments and treatment. In Romania, a ransomware attack on a healthcare IT platform left multiple hospitals offline, underscoring how attacks on shared digital infrastructure can cascade across many facilities at once and paralyze care delivery well beyond a single organization.
Jun 29, 2026
A ransomware attack forced the University of Mississippi Medical Center to take major systems offline, disrupting its phone network, broader IT environment, and Epic electronic health record platform. UMMC closed all 35 clinics across Mississippi, canceled appointments including chemotherapy and elective procedures, and shifted staff to paper documentation while keeping hospitals and emergency departments open. The medical center said it was working with the FBI, outside cybersecurity specialists, and vendors to investigate the intrusion and restore operations. UMMC later reopened clinics as systems were gradually brought back online, but the fallout extended beyond the immediate outage. Subsequent reporting said the incident may have exposed the organization to potential federal privacy-law issues, raising questions about whether protected health information was adequately safeguarded during the attack. The case highlights how ransomware against healthcare providers can quickly disrupt patient care, delay treatment, and create regulatory risk alongside operational recovery.
Jun 29, 2026
Richmond Behavioral Health Authority (RBHA) and MedStar Health, two major healthcare providers in the Mid-Atlantic region, have disclosed significant ransomware incidents resulting in the exposure of sensitive patient data. RBHA reported that hackers gained unauthorized access to its systems on September 29, 2025, deploying ransomware that encrypted files containing personal and protected health information for up to 113,232 individuals. Although RBHA stated there was no definitive evidence of patient data being accessed, the organization is notifying all potentially affected individuals and has implemented enhanced security measures, including third-party monitoring and stronger data policies. MedStar Health, which operates hospitals and care sites across Maryland, Virginia, and Washington D.C., confirmed a separate ransomware attack attributed to the Rhysida group, which claims to have exfiltrated 3.7 terabytes of data, including over 7 million pieces of patient information. The breach, occurring between September 12 and 16, 2025, involved the compromise of names, dates of birth, Social Security numbers, and detailed patient care information. MedStar has begun notifying affected patients and is offering complimentary identity monitoring services to those whose most sensitive data was exposed. Both incidents highlight the ongoing threat of ransomware to healthcare organizations and the significant risks to patient privacy and data security.
Jun 29, 2026