NEW YORKSocial EngineeringHealthcareHealthcarePhishingStolen CredentialsCustomer Data InvolvedHealth (basic)Identity (basic)MediumResolved

MEMORIAL SLOAN-KETTERING CANCER CENTER

bd_e88465727c36ec76 · schema v1 · pii pii-v1

Severity

Medium

Discovered

—

Filed

Jun 25, 2024

To disclose

—

Affected

12,274

Linked

2 filings

Confidence

97%

Full breach record for MEMORIAL SLOAN-KETTERING CANCER CENTER →7 incidents on file

Memorial Sloan Kettering Cancer Center reported to HHS on 2024-06-25 a Hacking/IT Incident (email phishing scheme) affecting 12,274 individuals. An employee was targeted via phishing, exposing PHI including names, addresses, dates of birth, diagnoses, lab results, medications, and other treatment information. Breached information was located in Email. The CE notified HHS, affected individuals, and media, and implemented additional safeguards and staff retraining.

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Leak gap clock✗ Leak >180d

⚠ no discovery dateNo discovery date was extracted, so no notification clock can be evaluated.

⚠ No discovery dateThe OCR public portal omits the discovery date, so the 60-day notification clock cannot be evaluated from this source — only that the filing was submitted.

Incident timeline — partial

? — ?

Breach window unknown

Jun 25, 2024

Filed

—

Corroborated · see linked filings

Compliance clocks stay unassessable until a regulatory filing lands. Dashed segments fill in automatically when corroboration arrives.

This filing is one of 2 about the same incident.View merged incident

A leak claim by meow about this victim predates this filing by 196 days.View originating leak claim

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Sitemeowbd_f86d359e2600fccc2023-12-12 · +196dVerified

Name: MEMORIAL SLOAN-KETTERING CANCER CENTER
norm: memorial sloan kettering cancer center
Domain: mskcc.org
Industry: Health Care Services

Name: MEMORIAL SLOAN-KETTERING CANCER CENTER
norm: memorial sloan kettering cancer center
Domain: mskcc.org
Industry: Health Care Services
Industry: Healthcaresource default

Discovered: Not extracted — the OCR public portal omits it
Materiality determined: —
Notification sent: —
Affected individuals: 12,274nationwide
Data types: Health (basic)Identity (basic)
HHS breach type: Hacking / IT incident
Where the data lived: Email
Covered-entity type: Healthcare provider
Attack vector: Unauthorized Access
MITRE ATT&CK: T1566 PhishingT1078 Valid Accounts
Threat actor: External
Regulator citations: HHS OCR notified
Initial access: phishing_link

During the incident: Notified HHS
Notified affected individuals
Notified media and provided substitute notice
Implemented additional administrative, technical, and security safeguards
Retrained staff on email security
Changes made: Additional administrative safeguards implemented
Additional technical safeguards implemented
Additional security safeguards implemented
Staff retrained on email security
Source: Quoted from the filing itself, not independently verified.

Compliance flags: Leak >180dHHS notified
Discovery-date grounding: no discovery dateNo discovery date was extracted, so no notification clock can be evaluated.
Clock breakdown: Statute Window Elapsed Threshold Status
HIPAA
Discovered: not extracted
→ Notified: not extracted
— regulatory submission HHS notified

Statute	Window	Elapsed	Threshold	Status
HIPAA	Discovered: not extracted → Notified: not extracted	—	regulatory submission	HHS notified

Status: No extraction artifact recorded for this disclosure.

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://ocrportal.hhs.gov/ocr/breach/breach_report.jsf
DisclosureLens renders the full SEC/HHS filing inline below from the originating regulator’s public record (§4.5 fair report privilege).
Filed at: Jun 25, 2024
Raw hash: 811a7b5fd6ac3b33be231eecb4701025607bd66ffb34edce2d0938df1ad63fbf

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Linked disclosures

Ransomware claims (1)

Reporting entityMEMORIAL SLOAN-KETTERING CANCER CENTER

Victim entityMEMORIAL SLOAN-KETTERING CANCER CENTER

IncidentUnauthorized Access

Stated responseNotified HHS

ComplianceLeak >180d

Extraction provenanceno artifact recorded

Source provenanceocrportal.hhs.gov

Source filing