- State
- NY
- Covered entity type
- Healthcare Provider
- Individuals affected
- 18,913
- Business associate present
- Yes
- Type of breach
- Unauthorized Access/Disclosure
- Location of breached information
- Network Server
- First seen by InfoSec Signals
- 9/23/2026
- Last seen in OCR export
- 9/23/2026
OCR description
The covered entity (CE), Memorial Sloan Kettering Cancer Center, reported that employees of its business associate misconfigured a server and exposed the protected health information (PHI) of 18,913 individuals. The PHI involved included names, Social Security numbers, dates of birth, addresses, financial information, diagnoses, lab results, medications prescribed, and other treatment information. The CE notified HHS, affected individuals, the media, and provided substitute notice. In response to the breach, the CE provided free credit monitoring and fraud protection services, sanctioned workforce members responsible for the breach, and took the affected network server offline.
Change history
- 9/23/2026Added to OCR's archive list
Source: U.S. Department of Health and Human Services, Office for Civil Rights, Breach Portal. Records are reproduced as published; entity names and figures are OCR's.