high severity September 01, 2025 · 3 min read

Prosper Data Breach (2025)

If you are a customer of Prosper, here’s what’s now in circulation.

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.

On September 1 2025, Prosper disclosed a data breach that exposed information tied to 17.6 million unique email addresses, including names, physical addresses, dates of birth, Social Security numbers, government-issued IDs, credit status, income levels, employment statuses, IP addresses, and browser user agent details.

Named in this incident?

You can’t unleak data. You can take away what it’s worth.

A leaked record is where it starts, not where it ends. What turns it into your front door is the look-up sites publishing your address beside your name — and those are what an AI reads when somebody asks about you. The free scan shows you both. We write to 580 companies.

See what is exposed about you — free scan →

Not ready yet? Run a free breach check on this email

We’ll check it against 13.1B+ leaked records right now — no account needed. Continuous monitoring & alerts are part of Protection.

What Public Reporting Shows

Public reporting indicates the company detected unauthorised access to its systems in September 2025. The breach affected both existing customers and loan applicants. Prosper stated it found no evidence that customer accounts or funds were accessed, and day-to-day customer operations continued without interruption. The exposed dataset contained highly sensitive personal and financial identifiers rather than login credentials for Prosper accounts themselves. Industry research from sources such as DoxxScan™ continuous monitoring lists the incident under its database of known breaches.

Why This Matters for You and Your Family

When 17.6 million records containing Social Security numbers, government IDs, addresses, and income details leave a financial platform, the risk extends beyond that single company. Identity thieves can combine these fragments with data from other breaches to open accounts in your name, file fraudulent tax returns, or impersonate you with lenders. For families this often means children’s records become collateral damage because parent and minor data frequently share the same address or phone number. The breach therefore touches anyone who applied for a loan or maintained an account with Prosper at any point in the past decade.

The Doxxing and Identity-Chain Implications

Credential leaks of this nature rarely stop at one site. The combination of email addresses, physical addresses, dates of birth, and government IDs creates ready-made anchors that link your online handles to your real-world identity. Once attackers map those connections they can pivot to gaming accounts, social-media profiles, or school portals that use the same email or password. Public reporting describes how such chains frequently lead to doxxing, account takeovers, and extortion attempts. Gaming accounts belonging to you or your children are especially vulnerable because they often reuse credentials and lack enterprise-grade protections.

You’ve used today’s 5 free articles · resets tomorrow

Create a free account to keep reading

The rest of this article comes straight back — free, no card, nothing you’ve already read goes away. Then see whether your own data is exposed too: the scan on this site is free with or without an account, and the account is what keeps the result after the emailed link expires.

Free reader account

No card, no charge. You read the blog without a limit — every article, no daily count — and it saves your exposure-scan results so you can open them again after the emailed link expires. We won’t email you anything else unless you tick the box asking us to. The next step shows what the paid plans add — free stays the first option on it.

Create a free account →

Free accounts are for personal use. If you’re reading for a company, that’s Signals (terms).

Reading this for a company?

GalaxyWarden Signals watches the organisations you name and emails you when one of them actually discloses — SEC 8-K Item 1.05 filings and corroborated breach records, with a JSON API. It monitors companies, not people: it does not scan you and does not remove your personal data.

See GalaxyWarden Signals →

Or make a free reader account first

Already have an account? Log in

What the free scan actually returns

Sample resultyou@email.comIllustrative — not a real person

Found on people-search siteswe remove these

These listings are live, public, and legal to remove — and removing them is what we do.

value redacted in this sampleage, relatives, address historySpokeo

value redacted in this samplephone, household, property recordsBeenVerified

value redacted in this sample580 companies checked

Found in breach recordsverifiedreported — unverified

Each record is labeled: confirmed breach data, or an attacker’s claim no one has verified.

verifiedvalue redacted in this samplepassword + phone · 2024telecom breach

unverifiedvalue redacted in this sampleclaimed in ransomware listing · 2026leak-site claim

Leaked data cannot be deleted from the internet — anyone claiming otherwise is lying. Broker listings can be removed. We do the second, and show you exactly what to fix from the first.

Report details & sourcing

Severity High includes account details that can be misused directly

Disclosed September 01, 2025

Last reviewed July 22, 2026

Affected 17.6M

Data exposed Browser user agent detailsCredit status informationDates of birthEmail addressesEmployment statusesGovernment issued IDsIncome levelsIP addresses +2 more

By GalaxyWarden Threat Research · Editorial & sourcing standards

Editorial & sourcing policy

GalaxyWarden is a breach-monitoring service and news aggregator. We do not exfiltrate, host, purchase, or redistribute stolen data. Breach information is compiled from publicly accessible sources and threat-intelligence platforms, and is reported as claims attributed to their source. We promptly correct or remove material shown to be inaccurate — see our content & takedown policy or write to support@galaxywarden.com.

Related breaches

high March 20, 2026