Prosper Data Breach: SSNs Exposed
By Join The Case · Published December 9, 2025 · Updated December 9, 2025 · 5 min read
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Dapeer Law, P.A., a top-rated class action law firm, is investigating the Prosper data breach. If you received notice that your information was exposed during this breach, you may be entitled to compensation. It's free to join our investigation to see if we can help you recover.

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Prosper Data Breach Lawsuit Investigation

On December 9, 2025, peer-to-peer lending platform Prosper confirmed a cybersecurity incident that compromised sensitive personal information. If you received a data breach letter from Prosper, you may be entitled to free identity-protection services and potential compensation. Request a no-cost, confidential case evaluation today.

Key Details at a Glance

  • Full Legal Name: Prosper Marketplace, Inc. (Prosper)
  • Date breach discovered: September 1, 2025
  • Unauthorized access window: June–August 2025
  • Consumer notifications mailed: December 9, 2025
  • Total people affected: 249,848 (all in Washington State)
  • Data exposed: Name, full date of birth, Social Security number, financial/banking information, other identifying data
  • Credit monitoring offered: Two years of Experian IdentityWorks at no cost (enroll by March 31, 2026)
Download Official Breach Notice (PDF)

What Happened?

Prosper detected unauthorized activity on its systems on September 1, 2025. An immediate response included halting the suspicious activity, engaging a leading cybersecurity firm, and notifying law enforcement. The investigation determined that between June and August 2025, threat actors executed database queries that obtained files containing personal information belonging to customers and loan applicants.

Prosper reports no evidence of unauthorized access to customer accounts or funds, and its customer-facing operations remained uninterrupted throughout the incident.

Information Involved

After a detailed review finalized on November 26, 2025, Prosper concluded that the following categories of data were present in the compromised files:

  • Name
  • Full date of birth
  • Social Security number
  • Financial and banking information
  • Other personal identifiers

Prosper’s Response

To mitigate harm to affected individuals, Prosper:

  • Enhanced internal security measures following the incident.
  • Engaged a third-party cybersecurity firm to investigate and contain the breach.
  • Reported the matter to law enforcement and is cooperating fully.
  • Offered two years of complimentary credit monitoring and identity restoration services via Experian. Impacted users must enroll by March 31, 2026 at experianidworks.com/1bcredit with the activation code provided in their letter.

Recommended Actions for Impacted Individuals

  • Enroll in the free Experian IdentityWorks program before the deadline.
  • Remain vigilant by reviewing bank statements, credit reports, and account activity for unfamiliar transactions.
  • If you suspect identity theft or fraud, file a police report and retain copies for your records.

Company Overview

Prosper operates the first peer-to-peer lending platform in the United States.

Frequently Asked Questions

I received a data breach letter from Prosper — what should I do?

Follow the enrollment instructions in the letter to activate two years of free Experian IdentityWorks services by March 31, 2026, and monitor your financial accounts for unusual activity.

What information did the Prosper breach expose?

The investigation determined that names, full dates of birth, Social Security numbers, financial and banking details, and other identifiers were included in the compromised data.

Did Prosper offer credit monitoring, and for how long?

Yes. Prosper is providing two years of complimentary credit monitoring and identity-restoration services through Experian.

How many people were affected by the Prosper data breach?

Prosper reported the incident to the Washington State Attorney General as impacting 249,848 individuals.

How do I submit a claim related to the Prosper data breach?

Complete the free case-review form on this page. An attorney will assess eligibility for monetary compensation or inclusion in a class action.

How can I get the official breach notice (PDF) for Prosper?

You can download it directly from the Washington Attorney General’s website: Prosper Breach Notice (PDF).

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