AccidentalHealthcareHealthcareMisdeliveryCustomer Data InvolvedPHIIdentity (basic)Government IDMediumResolved

MASS GENERAL BRIGHAM INCORPORATED

bd_b9164e3d375ee525 · schema v1 · pii pii-v2

Severity

Medium

Discovered

Sep 1, 2026

Filed

Sep 1, 2026

To disclose

—

Affected

1state residents only

Confidence

69%

Full breach record for MASS GENERAL BRIGHAM INCORPORATED →15 incidents on file

Mass General Brigham Medical Group notified a patient that on August 26, 2026, a workforce member inadvertently sent a document containing PHI (name, DOB, driver's license, SSN, address, email, phone) to the incorrect patient via the secure patient portal. The error was discovered on September 1, 2026, when the recipient notified the sender. The document was removed from the recipient's chart. The organization is offering 24 months of credit monitoring.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 6 days

Aug 26, 2026

Begins

Sep 1, 2026

Discovered

Sep 1, 2026

Filed

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

Name: MASS GENERAL BRIGHAM INCORPORATED
norm: mass general brigham
Domain: massgeneralbrigham.org

Name: MASS GENERAL BRIGHAM INCORPORATED
norm: mass general brigham
Domain: massgeneralbrigham.org
Industry: Healthcarellm

Discovered: Sep 1, 2026
Breach occurred: Aug 26, 2026
Undetected for: 6 daysoccurrence → discovery
Materiality determined: —
Notification sent: Sep 9, 2026
Affected individuals: 1state-resident count only
Data types: PHIIdentity (basic)Government ID
Attack vector: Unknown
Threat actor: Internal

During the incident: Contacted Chart Corrections to remove the document
Providing 24 months of free credit monitoring and other services through Experian’s IdentityWorks
Changes made: Strengthen safeguards
Promote training, education, and accountability across our workforce
Source: Quoted from the filing itself, not independently verified.

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://www.mass.gov/doc/2026-1571-massachusetts-general-brigham-medical-group/download
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 1, 2026
Raw hash: 33fcc45ed6d44e3fc4f325f40ef7555aaa14c3109aaa4345599dbe07887d3ea7

Reporting entityMASS GENERAL BRIGHAM INCORPORATED

Victim entityMASS GENERAL BRIGHAM INCORPORATED

Incidentdiscovered Sep 1, 2026

Stated responseContacted Chart Corrections to remove the document

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov