Regulator-posted notice

Breach notice filed by Memorial Sloan Kettering Cancer Center (June 2024)

Organization named: Memorial Sloan Kettering Cancer Center Provisional: identity as filed, not yet matched to the directory
Type as the source lists it: Hacking/IT Incident

What the sources say

HHS OCR breach portal (HIPAA breaches affecting 500 or more individuals) Primary notice

Posted on the HHS Office for Civil Rights breach portal with a submission date of June 25, 2024.

Organization as reported: Memorial Sloan Kettering Cancer Center, NY
Entity type as reported: Healthcare Provider
Category as reported: Hacking/IT Incident
Location of information as reported: Email
Submission date: June 25, 2024
Observed by BreachRecords: 2026-10-18 16:15 UTC (revision 9836, row:975)
Archived copy: Held in the private archive (provenance)

The covered entity (CE), Memorial Sloan Kettering Cancer Center, reported that an employee was the subject of an email phishing scheme that affected the protected health information (PHI) of 12,274 individuals. The PHI involved names, addresses, dates of birth, diagnoses, lab results, medications, and other treatment information. The CE notified HHS, the affected individuals, the media, and provided substitute notice. In response to the breach, the CE implemented additional administrative, technical, and security safeguards. Staff were retrained on email security.
The source's own words, from the revision above.

Figures, per source

12,274 individuals affected (total reported), according to the HHS Office for Civil Rights breach portal, source date June 25, 2024, revision observed 2026-10-18.

Each figure is one source's figure with the basis that source gave. Figures from different sources are shown side by side and are not added, averaged or chosen between.

Timeline

Source dates are the dates the sources give. Observation dates are when BreachRecords recorded each revision.

2024-06-25Submission date (HHS Office for Civil Rights breach portal)
2026-10-18Observed by BreachRecords (revision 9836)
2026-10-19Approved by a reviewer

Organizations linked by a reviewer

Memorial Sloan Kettering Cancer Center Named as the covered entity Provisional: identity as filed, not yet matched to the directory Linked 2026-10-19, method provisional.

Archived evidence

3dbc27dd5742e041cc1e7fe18cc669e2901fbd3b86b7007ed27948ff4d406e1f
text/csv, 5,530,996 bytes, retrieved from HHS Office for Civil Rights breach portal, 2026-10-18 16:15 UTC. Archived privately · Provenance · Source page

Records reflect source filings as of the dates shown. BreachRecords is not a regulator.

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