HackingFinancial ServicesFinanceStolen CredentialsCustomer Data InvolvedData ExfiltratedPIIIdentity (basic)Government IDFinancial accountMediumContained

Prosper Marketplace, Inc.

bd_0e596803e4bc415f · schema v1 · pii pii-v1

Severity

Medium

Discovered

Sep 1, 2025

Filed

Dec 9, 2025

To disclose

14 weeks

Affected

Not disclosed

Linked

14 filings

Confidence

64%

Full breach record for Prosper Marketplace, Inc. →3 incidents on file

Prosper Marketplace, Inc. disclosed a cybersecurity event discovered on September 1, 2025, involving unauthorized database queries between June and August 2025. Personal information, including government identifiers and basic identity data, was obtained. No unauthorized account access or fund theft occurred. Prosper engaged a cybersecurity firm, reported to law enforcement, and offers two years of credit monitoring via Experian.

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Incident timeline

undetected · 92 days

discovery → filing · 14 weeks / 99 days

Jun 1, 2025

Begins

Sep 1, 2025

Discovered

Dec 9, 2025

Filed

vs. sector median

+6 wks slower

This filing is one of 14 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

Indiana State AGbd_064375e1021db3242025-12-09Verified
California State AGbd_1d8dc2966340fc3f2025-12-09Verified
Washington State AGbd_371b15508a6d2c9c2025-12-09Verified
Montana State AGbd_9747b8377985ec6c2025-12-09Verified

Show 6 more filings ↓up to 2d gap

Nebraska State AGbd_d38f45326410ee322025-12-09Verified
Iowa State AGbd_d6c1820c7624a9c42025-12-09Verified
Nebraska State AGbd_d7d33fc3f88c47e62025-12-09Verified
Massachusetts State AGbd_e27f6e5b922dd85d2025-12-09Verified
Texas State AGbd_a95dd486a1b3cf8d2025-12-10 · +1dVerified
South Carolina State AGbd_7e60fb558f4916482025-12-11 · +2dVerified

Showing first 10 of 13 linked disclosures.

Name: Prosper Marketplace, Inc.
norm: prosper marketplace
Domain: prosper.com

Name: Prosper Marketplace, Inc.
norm: prosper marketplace
Domain: prosper.com
Industry: Financial Servicesllm

Discovered: Sep 1, 2025
Breach occurred: Jun 1, 2025 – Aug 31, 2025
Undetected for: 92 daysoccurrence → discovery
Materiality determined: —
Notification sent: Dec 9, 2025
Affected individuals: Not disclosed
Data types: Identity (basic)Government ID
Attack vector: Unauthorized Access
MITRE ATT&CK: T1119 Automated Collection
Threat actor: ExternalFinancial
Regulator citations: reported the incident to law enforcement
Initial access: valid_credentials

During the incident: Began working with a leading cybersecurity firm to investigate what happened
Reported the incident to law enforcement and offered our full cooperation
Offered two years of complimentary credit monitoring and identity restoration services through our preferred third-party vendor, Experian
Implemented enhanced security and monitoring controls
Changes made: Implemented enhanced security and monitoring controls
Ongoing information security reviews to strengthen our security and privacy programs and controls
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 14 weeks(99 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 10 states

View merged incident ↗

Indiana State AGDec 9 · first

California State AGDec 9 · first

Washington State AGDec 9 · first

Montana State AGDec 9 · first

Nebraska State AGDec 9 · first

Iowa State AGDec 9 · first

Nebraska State AGDec 9 · first

Massachusetts State AGDec 9 · first

Delaware State AGDec 9 · first · this page

Texas State AG+1d

South Carolina State AG+2d

Cascade drawn from the first 10 linked disclosures of 13 — the full spread may be wider.

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://attorneygeneral.delaware.gov/wp-content/uploads/sites/50/2026/01/Prosper_Sample-Individual-Notice-12-09-25.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Dec 9, 2025
Raw hash: c9f4a389e6537307f2ea8259a257ca416821216fe1cab7b75649ba6cc6567b38

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityProsper Marketplace, Inc.

Victim entityProsper Marketplace, Inc.

Incidentdiscovered Sep 1, 2025

Stated responseBegan working with a leading cybersecurity firm to investigate what happened

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenanceattorneygeneral.delaware.gov