There has been an official disclosure from Ascension Healthcare, one of the largest non-profit healthcare systems in the United States, that there has been a data breach involving patient information due to a cybersecurity incident linked to a former business partner. Ascension, which has already faced mounting scrutiny for its data protection practices, is facing another significant cybersecurity challenge with this latest breach, proving the company's commitment to security.
According to the health system, the recently disclosed incident resulted in the compromise of personal identifiable information (PII), including protected health information (PHI) of the patient. A cyberattack took place in December 2024 that was reported to have stolen data from a former business partner, a breach that was not reported publicly until now. This was the second major ransomware attack that Ascension faced since May of 2024, when critical systems were taken offline as a result of a major ransomware attack.
A breach earlier this year affected approximately six million patients and resulted in widespread disruptions of operations. It caused ambulance diversions in a number of regions, postponements of elective procedures, and temporary halts of access to essential healthcare services in several of these regions. As a result of such incidents recurring repeatedly within the healthcare sector, concerns have been raised about the security posture of third-party vendors and also about the potential risks to patient privacy and continuity of care that can arise.
According to Ascension's statement, the organisation is taking additional steps to evaluate and strengthen its cybersecurity infrastructure, including the relationship with external software and partner providers. The hospital chain, which operates 105 hospitals in 16 states and Washington, D.C., informed the public that the compromised data was "likely stolen" after being inadvertently disclosed to the third-party vendor, which, subsequently, experienced a breach as a result of an external software vulnerability.
In a statement issued by Ascension Healthcare System, it was reported that the healthcare system first became aware of a potential security incident on December 5, 2024. In response to the discovery of the breach, the organisation initiated a thorough internal investigation to assess the extent of the breach. An investigation revealed that patient data had been unintentionally shared with an ex-business partner, who then became the victim of a cybersecurity attack as a result of the data being shared.
In the end, it appeared that the breach was caused by a vulnerability in third-party software used by the vendor. As a result of the analysis concluded in January 2025, it was determined that some of the information disclosed had likely been exfiltrated during this attack.
In spite of Ascension failing to disclose the specific types of data that were impacted by the attack, the organization did acknowledge that multiple care sites in Alabama, Michigan, Indiana, Tennessee, and Texas have been affected by the attack.
In a statement released by Ascension, the company stressed that it continues to collaborate with cybersecurity experts and legal counsel to better understand the impact of the breach and to inform affected individuals as necessary.
In addition, the company has indicated that in the future it will take additional steps to improve data sharing practices as well as third party risk management protocols.
There is additional information released by Ascension that indicates that the threat actors who are suspected of perpetrating the December 2024 incident likely gained access to and exfiltrated sensitive medical and personal information.
There are several types of compromised information in this file, including demographics, Social Security numbers, clinical records, and details about visits such as names of physicians, names, diagnoses, medical record numbers, and insurance provider details.
Although Ascension has not provided a comprehensive estimate of how many people were affected nationwide, the organization did inform Texas state officials that 114,692 people were affected by the breach here in Texas alone, which was the number of individuals affected by the breach.
The healthcare system has still not confirmed whether this incident is related to the ransomware attack that occurred in May 2024 across a number of states and affected multiple facilities.
It has been reported that Ascension Health's operations have been severely disrupted since May, resulting in ambulances being diverted, manual documentation being used instead of electronic records, and non-urgent care being postponed.
It took several weeks for the organization to recover from the attack, and the cybersecurity vulnerabilities in its digital infrastructure were revealed during the process. In addition to revealing that 5,599,699 individuals' personal and health-related data were stolen in the attack, Ascension later confirmed this information.
Only seven of the system's 25,000 servers were accessed by the ransomware group responsible, but millions of records were still compromised.
The healthcare and insurance industries continue to be plagued by data breaches. It has been reported this week that a data breach involving 4,052,972 individuals, resulting from a cyberattack in February 2024, has affected 4,052,972 individuals, according to a separate incident reported by VeriSource Services, a company that manages employee administration.
A number of these incidents highlight the growing threat that organisations dealing with sensitive personal and medical data are facing. Apparently, the December 2024 breach involving Ascension's systems and networks was not caused by an internal compromise of its electronic health records, but was caused by an external attack.
Neither the health system nor the former business partner with whom the patient information was disclosed has been publicly identified, nor has the health system identified the particular third-party software vulnerability exploited by the attackers.
Ascension has also recently announced two separate third-party security incidents that are separate from this one.
A notice was posted by the organisation on April 14, 2025, concerning a breach that took place involving Scharnhorst Ast Kennard Gryphon, a law firm based in Missouri. The organisation reported that SAKG had detected suspicious activity on August 1, 2024, and an investigation later revealed that there had been unauthorised access between the 17th and the 6th of August 2024.
Several individuals affiliated with the Ascension health system were notified by SAKG on February 14, 2025, about the breach. In that incident, there were compromised records including names, phone numbers, date of birth and death, Social Security numbers, driver's license numbers, racial data, and information related to medical treatment.
A number of media inquiries have been received regarding the broader scope of the incident, including whether or not other clients were affected by the breach, as well as how many individuals were affected in total. Separately, Ascension announced another data security incident on March 3, 2025 that involved Access Telecare, a third-party provider of telehealth services in the area of Ascension Seton in Texas.
As with previous breaches, the Ascension Corporation clarified that the breach did not compromise its internal systems or electronic health records, a report filed with the U.S. Department of Health and Human Services Office for Civil Rights (HHS OCR) confirmed on March 8, 2025, that Access Telecare had experienced a breach of its email system, which was reported on March 8, 2025. It is estimated that approximately 62,700 individuals may have been affected by the breach.
In light of these successive disclosures, it is becoming increasingly apparent that the healthcare ecosystem is at risk of third-party relationships, as organisations continue to face the threat of cybercriminals attempting to steal sensitive medical and personal information from the internet. As a response to the recent security breach involving a former business partner, Ascension has offered two years of complimentary identity protection services to those who have been affected.
This company offers credit monitoring services, fraud consultations, identity theft restoration services, aimed at mitigating potential harm resulting from unauthorized access to personal and health information, including credit monitoring, fraud consultation, and identity theft restoration services.
Even though Ascension has not provided any further technical details about the breach, the timeline and nature of the incident suggest that it may be related to the Clop ransomware group's widespread campaign against data theft.
There was a campaign in late 2024 that exploited a zero-day security vulnerability in the Cleo secure file transfer software and targeted multiple organisations. The company has not officially confirmed any connection between the breach and the Clop group, and a spokesperson has not responded to BleepingComputer's request for comment.
Ascension has not encountered any major cybersecurity incidents in the past, so it is not surprising that this is not the first time they have experienced one.
According to Ascension Healthcare's official report from May 2024, approximately 5.6 million patients and employees were affected by a separate ransomware infection attributed to the Black Basta group of hackers. Several hospitals were adversely affected by a security breach that occurred due to the inadvertent download of a malicious file on a company device by an employee.
A number of data sets were exposed as a result of that incident, including both personal and health-related information, illustrating how the healthcare industry faces ongoing risks due to both internal vulnerabilities and external cyber threats. Despite the ongoing threat of cybersecurity in the healthcare industry, the string of data breaches involving Ascension illustrates the need to be more vigilant and accountable when managing third-party relationships.
Even in the case of uncompromised internal systems, vulnerabilities in external networks can still result in exposing sensitive patient information to significant risks, even in cases of uncompromised internal systems. To ensure that healthcare organisations are adequately able to manage vendor risk, implement strong data governance protocols, and implement proactive threat detection and response strategies, organisations need to prioritise robust vendor risk management.
A growing number of regulatory bodies and industry leaders are beginning to realize that they may need to revisit standards that govern network sharing, third-party oversight, and breach disclosure in an effort to ensure the privacy of patients in the increasingly interconnected world of digital health.
