Mass General Brigham Incorporated data breach
Mass General Brigham Incorporated appears in 2 breach notices filed with New Hampshire DOJ and Montana DOJ, most recently reported on October 23, 2025.
Breach notices filed with regulators
| Reported | Filed with | Breach date(s) | People affected | Data involved | Source |
|---|---|---|---|---|---|
| Oct 23, 2025 | New Hampshire DOJ | Not listed | Not listed | Not listed | Notice ↗ |
| Dec 18, 2020 | Montana DOJ | Nov 23, 2020 – Nov 24, 2020 | 2 Montana residents | Not listed | Notice ↗ |
Each row is a notice as published by the agency. For state lists, the number affected counts only that state's residents; HHS lists the total reported. SEC rows are Form 8-K Item 1.05 filings, which usually don't give a count. A notice does not mean a settlement exists, and a settlement may cover a different incident than a given notice.
Is there a settlement?
We don't track an open class-action settlement for Mass General Brigham Incorporated right now. Settlements usually come months or years after a breach. Get an email when new settlements are announced.
What you can do now
- Read the notice letter if you got one. It says what data was involved and may offer free credit monitoring with an enrollment deadline.
- Consider a free credit freeze at Equifax, Experian and TransUnion, especially if your Social Security number was involved.
- Change reused passwords and turn on two-factor authentication.
- Watch your bank, card and insurance statements for activity you don't recognize.
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