BreachCensus

Mass General Brigham

United States of America

Mass General Brigham is an organisation in Massachusetts. It appears on the Massachusetts Attorney General breach-notification register with 15 confirmed incidents; the most recent notice was filed on November 6, 2025.

Data as of August 31, 2026.

Sources

Confirmed incident

US-MA

Disclosed
November 6, 2025

Timeline

  1. November 6, 2025
    Reported to regulator Regulator

    MA AG breach notification: 23 Massachusetts residents affected

    source
What a Massachusetts notice means

Required under M.G.L. c. 93H. Notice to the Attorney General is required for a breach affecting any number of Massachusetts residents' personal information -- the statute sets no minimum count.

Note: the count is Massachusetts residents only, not a total.

Massachusetts breach-notification register ↗

Confirmed incident

US-MA

Disclosed
March 16, 2023

Timeline

  1. March 16, 2023
    Reported to regulator Regulator

    MA AG breach notification: 1 Massachusetts residents affected

    source
Confirmed incident

US-MA

Disclosed
March 13, 2023

Timeline

  1. March 13, 2023
    Reported to regulator Regulator

    MA AG breach notification: 1 Massachusetts residents affected

    source
Confirmed incident

US-MA

Disclosed
February 21, 2023

Timeline

  1. February 21, 2023
    Reported to regulator Regulator

    MA AG breach notification: 1 Massachusetts residents affected

    source
Confirmed incident

US-MA

Disclosed
February 14, 2023

Timeline

  1. February 14, 2023
    Reported to regulator Regulator

    MA AG breach notification: 1 Massachusetts residents affected

    source
Confirmed incident

US-MA

Disclosed
January 31, 2023

Timeline

  1. January 31, 2023
    Reported to regulator Regulator

    MA AG breach notification: 1 Massachusetts residents affected

    source
Confirmed incident

US-MA

Disclosed
January 19, 2023

Timeline

  1. January 19, 2023
    Reported to regulator Regulator

    MA AG breach notification: 1 Massachusetts residents affected

    source
Confirmed incident

US-MA

Disclosed
October 28, 2022

Timeline

  1. October 28, 2022
    Reported to regulator Regulator

    MA AG breach notification: 1 Massachusetts residents affected

    source
Confirmed incident

US-MA

Disclosed
October 3, 2022

Timeline

  1. October 3, 2022
    Reported to regulator Regulator

    MA AG breach notification: 1 Massachusetts residents affected

    source
Confirmed incident

US-MA

Disclosed
September 14, 2022

Timeline

  1. September 14, 2022
    Reported to regulator Regulator

    MA AG breach notification: 3 Massachusetts residents affected

    source
Confirmed incident

US-MA

Disclosed
August 24, 2022

Timeline

  1. August 24, 2022
    Reported to regulator Regulator

    MA AG breach notification: 5 Massachusetts residents affected

    source
Confirmed incident

US-MA

Disclosed
March 15, 2022

Timeline

  1. March 15, 2022
    Reported to regulator Regulator

    MA AG breach notification: 1 Massachusetts residents affected

    source
Confirmed incident

US-MA

Disclosed
October 4, 2021

Timeline

  1. October 4, 2021
    Reported to regulator Regulator

    MA AG breach notification: 1 Massachusetts residents affected

    source
Confirmed incident

US-MA

Disclosed
September 20, 2021

Timeline

  1. September 20, 2021
    Reported to regulator Regulator

    MA AG breach notification: 1 Massachusetts residents affected

    source
Confirmed incident

US-MA

Disclosed
December 18, 2020

Timeline

  1. December 18, 2020
    Reported to regulator Regulator

    MA AG breach notification: 28,465 Massachusetts residents affected

    source

Related

Disclosed around the same time