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Breach occurred 2025-09-01Verifiedprosper.com
What happened
In September 2025, Prosper announced that it had detected unauthorised access to their systems, which resulted in the exposure of customer and applicant information. The data breach impacted 17.6M unique email addresses, along with other customer information, including US Social Security numbers. Prosper advised that they did not find any evidence of unauthorised access to customer accounts and funds, and that their customer-facing operations were uninterrupted. Further information about the incident is contained in Prosper's FAQs.
Data exposed
Frequently asked questions
The Prosper data breach occurred on September 1, 2025. It was added to Have I Been Pwned's breach catalog on October 16, 2025.
17,605,276 accounts were affected by the Prosper data breach, according to Have I Been Pwned's records.
The Prosper breach exposed the following data types: Browser user agent details, Credit status information, Dates of birth, Email addresses, Employment statuses, Government issued IDs, Income levels, IP addresses, Names, Physical addresses.
Yes. Have I Been Pwned has verified the Prosper breach, meaning there's confirmed evidence the exposed data is genuine and tied to real accounts.
Use KazaSec's free Email Breach Checker (/tools/breach-check) to check whether a specific email address has surfaced in the Prosper breach, or any other known breach — the tool never stores what you search.
Our free Email Breach Checker tells you whether a specific email address has surfaced in this breach — or any other known breach — without ever storing what you search.
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