Ascension Health Discloses Data Breach Affecting Over 5.5 Million Individuals
Ascension, one of the largest U.S. hospital operators, disclosed a data breach affecting 5,599,699 patients and employees. The disclosure and notification process began around December 22, 2024. The incident, a ransomware attack from May 2024, compromised various types of sensitive information.
Signal context
First seen: Dec 22, 2024
Last updated: Jul 1, 2026
Status: Public signal
Key points
- 5,599,699 patients and employees affected.
- Compromised information includes medical information, credit card information, bank account numbers, medical insurance information, Social Security numbers, and other personal data.
- The breach was a ransomware attack that occurred in May 2024.
Signal analysis
BetaThis analysis groups the signal by industry, likely incident action and impacted security area. It helps compare this signal with other published signals without treating the labels as final determinations.
Sector: Health Care and Social Assistance
Likely country: Location not provided
Watch ransomware, endpoint compromise and business interruption exposure.
- Source type: outside the affected organization
Impact area: Confidentiality, Availability
Likely asset: User or customer data
- 7 signals in the same sector
- 100 signals with the same likely impact area
- 1 signal linked to this organization/domain
External sources
Headlines for Tuesday, December 24, 2024 - Kansas Public Radiohttps://kansaspublicradio.org/daily-headlines/2024-12-24/headlines-for-tuesday-december-24-2024Public source from kansaspublicradio.org.
Massive Health Care Data Breach Threatens Millions - Forbeshttps://www.forbes.com/sites/steveweisman/2024/12/23/massive-health-care-data-breach-threatens-millions/Public source from forbes.com.
Ascension cyberattack impacted millions; leaked sensitive medical information - HPPRhttps://www.hppr.org/2024-12-23/ascension-cyberattack-impacted-millions-leaked-sensitive-medical-informationPublic source from hppr.org.
Scam of the day – December 23, 2024 – Ascension Data Breach Affects More Than 5 Million People | Scamicidehttps://scamicide.com/2024/12/22/scam-of-the-day-december-23-2024-ascension-data-breach-affects-more-than-5-million-people/Public source from scamicide.com.
December 2024 Data Breach Round Up - Findings.cohttps://findings.co/december-2024-data-breach-round-up/Public source from findings.co.
Related signals
Grouped by why the signal is relevant.
Sand Hills Medical Foundation Hit by Inc Ransomware, Patient Data Leaked
Sand Hills Medical Foundation in South Carolina was impacted by the Inc ransomware group, which claimed responsibility and leaked stolen data on June 15, 2026. Approximately 169,000 patients were affected, with exposed data including Protected Health Information (PHI), Social Security numbers, driver's licenses, and passports.
FortiBleed gekoppeld aan ransomwaregroepen INC en Lynx
The 'FortiBleed' cyber campaign, which previously exposed login credentials for thousands of Fortinet firewalls, has now been linked to the ransomware groups INC and Lynx. Forensic investigations revealed evidence on a Windows server used in the attack infrastructure, showing administrators had access to negotiation portals of both ransomware groups. This suggests a strong connection between the credential theft and subsequent extortion campaigns. Researchers estimate that over 430,000 FortiGate firewalls worldwide were targeted, with sniffers installed on approximately 19,000 systems to intercept network traffic.
eogb.co.uk Hit by Stormous Ransomware Group
eogb.co.uk, a UK-based organization, was claimed as a victim by the Stormous ransomware group. The incident was discovered on June 28, 2026, at 21:29 UTC, with deep access to Microsoft Dynamics GP, internal legal documents, partnership agreements, customer contracts, operational spreadsheets, financial reports, and executive documents.
Challenge Manufacturing Data Breach Exposes Social Security Numbers
Challenge Manufacturing, an automotive manufacturing company, disclosed a data breach to the Texas Attorney General on June 26, 2026. The Chaos ransomware group claimed responsibility on May 17, 2026, stating they obtained 270 GB of data from the company's systems.
Alamo Heights ISD Reports Data Breach Following Ransomware Attack
Alamo Heights Independent School District (ISD) reported a data breach impacting over 26,000 people, disclosed to the Texas Attorney General's office on June 25, 2026 (published June 26, 2026 UTC). The breach was linked to a ransomware attack by the Qilin group, which occurred on April 9, 2026. The compromised information included names, Social Security numbers, driver's license numbers, and bank and medical information.
AYA BANK Hit by Lapsus$ Ransomware Attack
AYA BANK, a prominent financial institution in Myanmar, fell victim to a ransomware attack by the Lapsus$ group, discovered on June 23, 2026. Lapsus$ claimed to have stolen over 120 gigabytes of data, including a full dump and PII, and threatened to sell it if a ransom was not paid. AYA Bank acknowledged a breach of an older application portal exposing some customer information but stated its core financial networks remained secure.