Prosper
MEDIUM RISKData breach — September 2025
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.
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What happened in the Prosper data breach?
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.
The exposed data included 10 types of personal information. Learn more about what a data breach means for you.
Quick answer — was Prosper hacked?
Yes. Prosper was breached in September 2025. The breach exposed 17,605,276 records including browser user agent details, credit status information, dates of birth. This breach has been independently verified. If your email was involved, your data may still be at risk today. Check if you were affected.
Why was the Prosper breach so dangerous?
The Prosper breach exposed 17,605,276 records — that is 17.6M people whose personal data is now circulating on the dark web. The combination of browser user agent details, credit status information, dates of birth makes this a medium-risk breach that should be addressed promptly.
Don't wait to find out — check if your email was exposed in this breach now.
What data was stolen in the Prosper breach?
Browser user agent details — may be combined with other breach data to build a profile for targeted attacks
Credit status information — can be used for direct financial fraud and unauthorised transactions
Dates of birth — used to verify identity for account takeover and fraud
Email addresses — used for phishing attacks and credential stuffing against your other accounts
Employment statuses — may be combined with other breach data to build a profile for targeted attacks
Government issued IDs — enables full identity theft including fraudulent credit applications
Income levels — may be combined with other breach data to build a profile for targeted attacks
IP addresses — combined with other data, used for identity theft and physical fraud
Names — used to build profiles and target you with personalised scams
Physical addresses — combined with other data, used for identity theft and physical fraud
Is the Prosper breach still dangerous in 2026?
Yes. Stolen data from the Prosper breach remains dangerous years after the incident. Research shows that over 65% of stolen credentials from older breaches have never been changed by the account holders. Attackers routinely compile data from multiple breaches to build complete profiles, and credentials from 2025 are still actively used in credential stuffing attacks today.
Personal information like email addresses, phone numbers, and dates of birth never expire. Even if you changed your Prosper password, the other exposed data can be combined with information from other breaches to target you. Learn more about how long stolen data stays dangerous.
Frequently asked about the Prosper breach
Approximately 17,605,276 user records were exposed in the Prosper breach in September 2025.
Yes. Leaked credentials are actively used in credential stuffing attacks years after a breach. If you reused your Prosper password elsewhere and haven't changed it, those accounts remain at risk today.
Enter your email in the free checker on EmailLeaked. We scan 12 billion+ breach records including the full Prosper dataset and tell you instantly whether your email was exposed and what data was taken.
Change your Prosper password immediately, change any other account where you used the same password, enable two-factor authentication on all important accounts, and monitor for phishing emails over the next 90 days.
Who was affected by the Prosper breach?
The Prosper data breach affected approximately 17,605,276 users who had accounts with the service. With 17.6M records exposed, this is one of the larger breaches tracked in our database of 970+ known breaches.
If you ever created an account with Prosper or used their services, your data may have been included in this breach. Check your email now to find out. You can also read our guide on what to do immediately after a data breach.
If your email was in the Prosper breach
Change your Prosper password immediately
Go to Prosper and change your password right now. Use a strong, unique password that you have never used anywhere else.
Change any account sharing that password
If you used the same password on other sites, change it on every one of them. Attackers test stolen credentials on hundreds of popular sites within hours.
Enable two-factor authentication
Turn on 2FA on Prosper and every important account. Even if your password is known, attackers cannot get in without the second factor.
Check your other accounts for this breach
Run a full email check to see every breach your email appears in — not just this one.
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