HackingHealthcareHealthcareStolen CredentialsSupply Chain (3P Vendor)Data ExfiltratedCustomer Data InvolvedIdentity (basic)Health (basic)PHILowContained

MEMORIAL SLOAN-KETTERING CANCER CENTER

bd_cfdfed5d5ebf622b · schema v1 · pii pii-v1

Severity

Low

Discovered

Jan 23, 2021

Filed

Mar 31, 2021

To disclose

10 weeks

Affected

4state residents only

Linked

2 filings

Confidence

64%

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

Memorial Sloan Kettering Cancer Center (MSK) notified patients of a breach involving its Accellion FileBridge document-sharing system. Unauthorized access occurred Jan 20-22, 2021. Data accessed included names, addresses, DOBs, and PHI. No SSNs or financial data were compromised. MSK took the system offline permanently and engaged IDX for support.

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Incident timeline

undetected · 3 days

discovery → filing · 10 weeks / 67 days

Jan 20, 2021

Begins

Jan 23, 2021

Discovered

Mar 31, 2021

Filed

vs. sector median

3 wks faster

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

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

HHS OCRbd_f3b0825a6dc1896d2021-03-31Verified

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

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

Discovered: Jan 23, 2021
Breach occurred: Jan 20, 2021 – Jan 22, 2021
Undetected for: 3 daysoccurrence → discovery
Materiality determined: —
Notification sent: Mar 31, 2021
Affected individuals: 4state-resident count only
Data types: Identity (basic)Health (basic)PHI
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1195 Supply Chain CompromiseT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Initial access: supply_chain

During the incident: Took the Accellion document-sharing system offline
Launched an investigation
Contracted with a data security firm, IDX, to assist in answering any questions
Provided access to a call center to answer questions and provide more information
Changes made: Taken the document-sharing system offline permanently
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 10 weeks(67 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings · 2 states

View merged incident ↗

HHS OCRMar 31 · first

Montana State AGMar 31 · first · this page

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://dojmt.gov/wp-content/uploads/Sloan-Notif.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Mar 31, 2021
Raw hash: 23e8a70063df65ad0b2ae0b5941edf0a09c2e3743dc68c9ceee304d996ec8be5

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityMEMORIAL SLOAN-KETTERING CANCER CENTER

Victim entityMEMORIAL SLOAN-KETTERING CANCER CENTER

Incidentdiscovered Jan 23, 2021

Stated responseTook the Accellion document-sharing system offline

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov