All Breaches
August 26, 2025 Verified Sensitive Record Healthcare

Marshfield Clinic 2025 Data Breach

The Marshfield Clinic data breach was a 2025 security incident involving unauthorized access to certain employee email accounts.

36 Thousand
Affected People
7
Data Types
Medium
Severity
Yes
Verification

Exposed Data Types

7
Names
Physical addresses
Phone numbers
Dates of birth
Health insurance information
Medical record numbers
Medical information

Additional Information

Added DateAugust 3, 2026
Breach DateAugust 26, 2025
Domainmarshfieldclinic.org
SourceHHS OCR and independent local reporting quoting the organization
Last Content UpdateAugust 3, 2026

Verification and editorial method

LeakData compares the incident name, date, affected-record count, and exposed data types with accessible sources. Unverified fields are not presented as facts, and records are updated when new evidence becomes available.

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Company Information

Company NameMarshfield Clinic
SectorHealthcare
CountryUnited States
Websitewww.marshfieldclinic.org

Risk Level

Medium

The reported impact exceeds 10 thousand and falls within the medium severity band.

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