MisuseHealthcareHealthcarePrivilege AbuseEmployee Data InvolvedTargetedIdentity (basic)Government IDHealth (basic)MediumContained

Massachusetts General Hospital

bd_ae572371e631aa17 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Mar 5, 2023

Filed

Apr 17, 2023

To disclose

6 weeks

Affected

1state residents only

Confidence

66%

Full breach record for Massachusetts General Hospital →76 incidents on file

Massachusetts General Hospital notified the NH AG of a data security incident involving one NH resident. A clinical research associate shared patient information via email on Sept 6-7, 2022. The incident was discovered on March 5, 2023. The hospital offered 24 months of credit monitoring.

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Incident timeline

undetected · 180 days

discovery → filing · 6 weeks / 43 days

Sep 6, 2022

Begins

Mar 5, 2023

Discovered

Apr 17, 2023

Filed

vs. sector median

5 wks faster

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed1 affectedView incident

Name: Massachusetts General Hospital
norm: massachusetts general hospital
Domain: massgeneral.org

Name: Massachusetts General Hospital
norm: massachusetts general hospital
Domain: massgeneral.org
Industry: Healthcarellm

Discovered: Mar 5, 2023
Breach occurred: Sep 6, 2022 – Sep 7, 2022
Undetected for: 180 daysoccurrence → discovery
Materiality determined: —
Notification sent: Mar 28, 2023
Affected individuals: 1state-resident count only
Data types: Identity (basic)Government IDHealth (basic)
Attack vector: Insider
MITRE ATT&CK: T1078 Valid AccountsT1119 Automated Collection
Threat actor: Internal
Regulator citations: Notified New Hampshire Attorney General Consumer Protection Bureau
Initial access: insider_action

During the incident: Began an investigation
Offered the impacted New Hampshire resident two years of complementary credit monitoring services
Enhanced training and education
Held individuals accountable for their actions
Addressed the incident with the responsible individual
Revised policies to ensure higher levels of professionalism and integrity among CRAs
Changes made: Enhanced training and education
Held individuals accountable for their actions
Addressed the incident with the responsible individual
Revised policies to ensure higher levels of professionalism and integrity among CRAs
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 6 weeks(43 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

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://mm.nh.gov/files/uploads/doj/remote-docs/massachusetts-general-hospital-brigham-20230417.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 17, 2023
Raw hash: aef460fb3643fae27d2a7730fee577160b3776fc6db2359e36dadd88750ac6ce

Reporting entityMassachusetts General Hospital

Victim entityMassachusetts General Hospital

Incidentdiscovered Mar 5, 2023

Stated responseBegan an investigation

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov