Prosper disclosed a data breach impacting 17.6 million accounts

Prosper disclosed a data breach impacting 17.6 million accounts. According to Have I Been Pwned, stolen data includes names, addresses, dates of birth, email addresses, Social Security numbers, government IDs, and other information. In September 2025 Prosper announced that unauthorised access to their systems had been detected, exposing customer and applicant information, with the breach affecting 17.6 million unique email addresses.

Prosper advised that there is no evidence of unauthorised access to customer accounts and funds, and that their customer-facing operations were uninterrupted. The company notified law enforcement and is investigating the incident with the help of a leading cybersecurity firm, and said it would offer free credit monitoring once the impacted data is confirmed. At the time of the notice, no ransomware groups claimed responsibility for the attack.