Wisner Baum LLP, a law firm, experienced an external system breach (hacking) that occurred between October 8 and October 9, 2025. The company discovered the breach on December 15, 2025. Wisner Baum LLP sent out notifications to affected clients and individuals on January 21, 2026. The firm referenced its investigation being complete and notices mailed, with enhanced monitoring and protections implemented.
Confirmed data types exposed in the breach include Social Security Numbers, driver's licenses, and names or other personal identifiers. At least 258 Massachusetts residents were affected, along with 56 Maine residents. The total number of affected individuals across all states is not publicly available. No medical records, financial accounts, or credit/debit numbers were compromised. The breach was a result of a security flaw in a SonicWall firewall.
Data breach details can emerge over time, and affected individuals may experience delayed notifications.