Prosper, a peer-to-peer lending marketplace, experienced a **data breach on September 2nd** due to unauthorized database queries by a hacker. The breach exposed **highly sensitive customer and applicant data**, including **names, Social Security numbers, government-issued IDs, employment/credit status, income levels, birth dates, physical addresses, IP addresses, and browser user-agent details**. While **no customer accounts or funds were accessed**, and **operations remained uninterrupted**, the stolen data—affecting **17.6 million unique email addresses**—poses severe risks for **phishing, identity theft, and fraud**. Prosper is offering **free credit monitoring** to affected individuals, but the exposure of such **comprehensive personal and financial information** significantly elevates the threat of long-term exploitation by cybercriminals.
TPRM report: https://www.rankiteo.com/company/prosper-marketplace
"id": "pro2893528102025",
"linkid": "prosper-marketplace",
"type": "Breach",
"date": "10/2025",
"severity": "85",
"impact": "4",
"explanation": "Attack with significant impact with customers data leaks"{'affected_entities': [{'customers_affected': '17.6 million unique email '
'addresses (exact number of '
'individuals unclear)',
'industry': 'Financial Services (Fintech)',
'name': 'Prosper',
'type': 'Peer-to-peer lending marketplace'}],
'attack_vector': 'Unauthorized database queries',
'customer_advisories': ['Check with Prosper for details on exposed data',
'Utilize free credit monitoring offered by Prosper',
'Follow password hygiene and MFA best practices',
'Stay vigilant against phishing/social engineering '
'attacks'],
'data_breach': {'data_exfiltration': 'Yes (data was stolen)',
'number_of_records_exposed': '17.6 million unique email '
'addresses (total individuals '
'unspecified)',
'personally_identifiable_information': ['Names',
'Social Security '
'numbers',
'Government-issued '
'IDs',
'Birth dates',
'Physical addresses',
'IP addresses'],
'sensitivity_of_data': 'High (includes SSNs, government IDs, '
'and financial/employment details)',
'type_of_data_compromised': ['Personally Identifiable '
'Information (PII)',
'Financial-related data '
'(employment status, credit '
'status, income levels)']},
'date_detected': '2023-09-02',
'description': 'Prosper, a peer-to-peer lending marketplace, suffered a data '
'breach on September 2nd due to unauthorized queries on '
'company databases storing customer and applicant data. The '
'breach exposed highly sensitive personal information, '
'including names, Social Security numbers, government-issued '
'IDs, employment and credit status, income levels, birth '
'dates, physical addresses, IP addresses, and browser '
'user-agent details. While no customer accounts or funds were '
'accessed and operations remained uninterrupted, the breach '
'affected 17.6 million unique email addresses. The exposed '
'data poses significant risks for phishing and identity theft.',
'impact': {'brand_reputation_impact': 'Potential reputational damage due to '
'exposure of sensitive personal data',
'data_compromised': ['Names',
'Social Security numbers',
'Government-issued IDs',
'Employment status',
'Credit status',
'Income levels',
'Birth dates',
'Physical addresses',
'IP addresses',
'Browser user-agent details',
'Email addresses (17.6 million unique)'],
'downtime': 'None (customer-facing operations not interrupted)',
'identity_theft_risk': 'High (exposed PII can be used for identity '
'theft)',
'operational_impact': 'None reported',
'payment_information_risk': 'None (no customer accounts or funds '
'accessed)',
'systems_affected': ['Company databases storing customer and '
'applicant data']},
'initial_access_broker': {'high_value_targets': ['Customer and applicant '
'databases']},
'post_incident_analysis': {'root_causes': ['Unauthorized queries on company '
'databases (potential insider '
'threat, misconfigured access '
'controls, or exploited '
'vulnerabilities)']},
'recommendations': ['Change passwords for Prosper and related financial '
'accounts (use strong, unique passwords and a password '
'manager)',
'Enable two-factor/multi-factor authentication on all '
'applicable accounts',
'Monitor for phishing attempts (avoid clicking unexpected '
'links/attachments)',
'Enroll in identity theft protection/monitoring services',
'Contact Prosper to verify what personal data was exposed '
'and utilize offered credit monitoring'],
'references': [{'source': 'Prosper FAQ Page'},
{'source': 'BleepingComputer'},
{'source': "Tom's Guide"}],
'response': {'communication_strategy': ['FAQ page updates',
'Customer notifications for data '
'verification and protective '
'measures'],
'remediation_measures': ['Offering free credit monitoring to '
'affected individuals']},
'title': 'Prosper Data Breach - Unauthorized Database Queries Expose Customer '
'and Applicant Data',
'type': 'Data Breach'}