Nium: Nium Data Breach Investigation

**Nium Reports Data Breach Affecting Sensitive Customer Information**

Nium, a global financial services platform, disclosed a data breach to the Massachusetts Attorney General’s office after detecting unauthorized access to its systems on November 3, 2025. The incident involved the potential compromise of sensitive personal identifiable information (PII) belonging to customers.

Following the breach, Nium launched an investigation, confirming that an unauthorized third party accessed and downloaded customer data. The exposed information varies by individual but may include names, Social Security numbers, email addresses, physical addresses, phone numbers, and dates of birth.

In response, Nium has begun notifying affected individuals via mail, detailing the specific data impacted and offering complimentary credit monitoring services. The breach notice filed with Massachusetts authorities provides further details on the incident.

Source: https://straussborrelli.com/2025/12/16/nium-data-breach-investigation/

Nium TPRM report: https://www.rankiteo.com/company/nium-inc-

"id": "niu1765901042",
"linkid": "nium-inc-",
"type": "Breach",
"date": "11/2025",
"severity": "85",
"impact": "4",
"explanation": "Attack with significant impact with customers data leaks"

{'affected_entities': [{'customers_affected': 'Multiple individuals',
                        'industry': 'Financial Services',
                        'name': 'Nium',
                        'type': 'Company'}],
 'attack_vector': 'Unauthorized Access',
 'customer_advisories': 'Complimentary credit monitoring services provided to '
                        'affected individuals',
 'data_breach': {'data_exfiltration': 'Yes',
                 'personally_identifiable_information': 'Yes',
                 'sensitivity_of_data': 'High',
                 'type_of_data_compromised': ['Name',
                                              'Social Security number',
                                              'Email address',
                                              'Physical address',
                                              'Phone number',
                                              'Date of birth']},
 'date_detected': '2025-11-03',
 'description': 'Nium reported a data breach where unauthorized access '
                'attempts to its file system resulted in certain customer '
                'information being downloaded. Sensitive personal identifiable '
                'information may have been compromised.',
 'impact': {'data_compromised': 'Sensitive personal identifiable information',
            'identity_theft_risk': 'High',
            'systems_affected': 'File system'},
 'investigation_status': 'Ongoing',
 'references': [{'source': 'Attorney General of the Commonwealth of '
                           'Massachusetts'}],
 'regulatory_compliance': {'regulatory_notifications': 'Filed breach notice '
                                                       'with the Attorney '
                                                       'General of the '
                                                       'Commonwealth of '
                                                       'Massachusetts'},
 'response': {'communication_strategy': 'Data breach notification letters '
                                        'mailed to impacted individuals',
              'incident_response_plan_activated': 'Yes'},
 'title': 'Nium Data Breach - Unauthorized Access to Sensitive Customer '
          'Information',
 'type': 'Data Breach'}