Harnish Group Data Breach Exposes Sensitive Personal Information
On November 11, 2025, the Harnish Group detected a data breach involving unauthorized access to sensitive personal identifiable information (PII) stored in its systems. Following the discovery, the company launched an investigation to assess the scope and impact of the incident.
The investigation confirmed that an unauthorized third party had accessed and potentially acquired PII, including names and Social Security numbers. The exact data exposed varies by individual. On December 22, 2025, Harnish Group began notifying affected individuals via mail, providing details on the compromised information and offering complimentary credit monitoring services.
The breach notice was filed with the Attorney General of Maine, where impacted residents were among the first to be notified. The incident highlights ongoing risks to personal data security in corporate systems.
Source: https://straussborrelli.com/2026/01/02/harnish-group-data-breach-investigation/
Harnish Group Inc. cybersecurity rating report: https://www.rankiteo.com/company/harnish-group-inc-
"id": "HAR1767375757",
"linkid": "harnish-group-inc-",
"type": "Breach",
"date": "11/2025",
"severity": "85",
"impact": "4",
"explanation": "Attack with significant impact with customers data leaks"{'affected_entities': [{'customers_affected': 'Impacted individuals (number '
'not specified)',
'name': 'Harnish Group',
'type': 'Organization'}],
'customer_advisories': 'Provided complimentary credit monitoring services and '
'a list of specific types of sensitive information '
'impacted',
'data_breach': {'personally_identifiable_information': 'Yes',
'sensitivity_of_data': 'High',
'type_of_data_compromised': ['Name',
'Social Security number']},
'date_detected': '2025-11-11',
'date_publicly_disclosed': '2025-12-22',
'description': 'Harnish Group experienced a data breach in which sensitive '
'personal identifiable information in its care may have been '
'compromised. The breach involved unauthorized access and '
'acquisition of personal data by a third party.',
'impact': {'data_compromised': 'Sensitive personal identifiable information',
'identity_theft_risk': 'High'},
'investigation_status': 'Completed',
'references': [{'source': 'Attorney General of Maine'}],
'regulatory_compliance': {'regulatory_notifications': 'Filed breach '
'notification with the '
'Attorney General of '
'Maine'},
'response': {'communication_strategy': 'Mailed data breach notification '
'letters to impacted individuals'},
'title': 'Harnish Group Data Breach',
'type': 'Data Breach'}