Email breach signal check — is your email in leaked data?

What an email breach check actually tells you

An email breach check answers one simple question with real consequences: has your email address — and the password attached to it — already leaked somewhere attackers can find it? Most people only discover the answer after an account gets hijacked, a card gets charged, or a "you've been hacked" extortion email lands in their inbox. Checking on purpose, before that happens, is one of the highest-value five-minute security habits you can build.

PrufAgent checks the Hudson Rock public infostealer index and can map the wider public digital footprint tied to an address. It does not query a historical breach catalog or name breached services. For historical breach notices, use Have I Been Pwned.

Data breaches vs. infostealer logs

A data breach is when a company you have an account with gets hacked and its user database leaks. Think of the big ones — LinkedIn, Adobe, Dropbox, MyFitnessPal, Canva. Your email plus a hashed (sometimes plaintext) password ends up in a dump that gets traded and indexed. The damage is scoped to that one service and whatever password you used there.

An infostealer log is worse and far less understood. Infostealers are malware (RedLine, Raccoon, Lumma, Vidar and similar) that silently infect a device — usually through a cracked program, a fake installer, or a malicious browser extension — and vacuum up everything stored in the browser: saved passwords, autofill data, and active session cookies. The harvested data is packaged into "logs" and sold in bulk. If your email shows up in an infostealer log, it means a specific device you used was compromised, and attackers may be holding your current passwords and live login sessions across many sites at once. That is a device-level emergency, not a single-service inconvenience.

Why an exposed email is a real problem

The threat almost never stops at the one leaked account. Here's how a single exposure turns into a cascade:

• Password reuse: The average person reuses the same handful of passwords. Attackers run automated "credential stuffing" — trying your leaked email-and-password pair against banks, email, shopping, and social sites — and any reuse gets popped.
• Account takeover: Your email is usually the recovery address for everything else. Control it, and an attacker can reset passwords on accounts that were never themselves breached.
• Session hijacking: Infostealer logs often include live session cookies, which let attackers skip the password and 2FA entirely by impersonating a logged-in browser.
• Targeted phishing and extortion: Leaked details make scam emails far more convincing, and old breached passwords are the centerpiece of "I recorded you" sextortion scams.

How to check if your email is exposed

You don't need technical skill — just your email address. Here's the honest, practical process:

1. Enter your email above. The free pass checks the Hudson Rock public infostealer index and returns a masked aggregate status and counts.
2. Check the addresses that matter most. Start with your primary email, then your recovery and old "junk signup" addresses — those are often the most exposed because they were used everywhere.
3. Unlock the Public Signal Report after secure checkout to review aggregate infostealer status and source-linked public-footprint evidence in one place.
4. Act on what you find using the checklist further down this page.

A note on limits: no signal from this source means only that Hudson Rock returned no aggregate infostealer match at check time. It is not proof that an email has never appeared in a historical breach or another source.

What PrufAgent's exposure check shows

PrufAgent checks Hudson Rock's public infostealer index and combines the aggregate status with a live scan of public web sources. The report can include:

To be clear: PrufAgent reports masked aggregate status and counts, not raw malware-log records, device details, passwords, or a historical list of breached services.

What to do if your email is exposed

Finding an exposure is good news, because now you can close the door. Work through this in order:

1. Change important passwords from a clean device if an infostealer signal is returned, starting with email and financial accounts.
2. Stop reusing passwords. Use a password manager so every account has a unique, strong password. This single change neutralizes credential-stuffing.
3. Turn on two-factor authentication (2FA) everywhere it's offered, prioritizing email, banking, and anything tied to money. Prefer an authenticator app over SMS.
4. If you appear in an infostealer log, treat it as a device compromise. Run a reputable malware scan, sign out of all active sessions on your important accounts, and rotate passwords from a known-clean device — not the infected one.
5. Watch for targeted phishing. Expect more convincing scam emails after a leak. Never act on urgent "security alert" links; navigate to sites directly.
6. Reduce your future exposure. See what else is publicly tied to you with a reverse email lookup, learn to find which accounts use an email, and consider a cleanup pass using our guide to delete yourself from people-search sites.