Where does the Mass General Brigham Incorporated case file come from?

Every entry is taken from the breach report Mass General Brigham Incorporated lodged with the New Hampshire Attorney General. Nothing here is estimated.

Why do the incident date and the report date differ?

Companies usually investigate before they report. The gap between the two dates shows how long that took.

What does the records-affected figure count?

It is the number the company gave the state. It can cover residents of that state only, so the national total may be higher.

Does this case file change over time?

Yes. When a company files an update or a new state publishes its copy of the report, the dates and counts here are refreshed.

Case file

Case File: Mass General Brigham Incorporated Data Breach

This file collects the dated facts on record for the Mass General Brigham Incorporated incident. The state report is dated October 23, 2025.

Timeline

October 23, 2025Report filed in New HampshireDate the notice was lodged with the New Hampshire Attorney General.

Case facts

Filing state: New Hampshire
Date reported: October 23, 2025
Receiving office: New Hampshire Attorney General

Case notes

Mass General Brigham Incorporated filed notice of a data security incident with the New Hampshire Attorney General's office on October 23, 2025. This public filing indicates an ongoing investigation into a data security event.

The specific categories of data involved in this breach, as well as the number of individuals affected, were not detailed in the public record. The filing broadly concerns personal information that may have been accessed without authorization.

The breach type is listed as "unspecified," and the breach date is noted as "unknown" within the available filing data. Mass General Brigham Incorporated has confirmed that an investigation into the full scope and impact of this incident is underway.

Individuals who receive a formal notification letter from Mass General Brigham Incorporated are advised to carefully read its contents for any specific recommendations provided by the company.

General protective steps include remaining vigilant for any unusual activity or unauthorized transactions across personal accounts. It is always prudent to review statements and account activity regularly.

While not specifically recommended in this filing, broadly applicable security measures include being cautious of unsolicited communications, especially those requesting personal details. You might also consider placing a fraud alert or credit freeze with major credit reporting agencies, which are general precautions for data security.

These details are based on information publicly filed with regulatory authorities and reflect the current known status of the incident.

Questions about this case file

Where does the Mass General Brigham Incorporated case file come from?: Every entry is taken from the breach report Mass General Brigham Incorporated lodged with the New Hampshire Attorney General. Nothing here is estimated.
Why do the incident date and the report date differ?: Companies usually investigate before they report. The gap between the two dates shows how long that took.
What does the records-affected figure count?: It is the number the company gave the state. It can cover residents of that state only, so the national total may be higher.
Does this case file change over time?: Yes. When a company files an update or a new state publishes its copy of the report, the dates and counts here are refreshed.

New Hampshire data breaches

Filing source: New Hampshire Attorney General

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Timeline

Case facts

Case notes

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