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

What an email breach check actually tells you

An email exposure check can show whether a supported public source returned an aggregate signal associated with your email. It cannot establish which data was captured or whether any credential is current. Checking early and taking proportionate precautions can still reduce account-takeover risk.

PrufAgent checks a supported public infostealer-exposure 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 can contain data collected by malware from an infected device, including saved passwords, autofill data, or session cookies. An aggregate index match suggests the email appeared in data associated with infostealer collection, so precautionary password rotation, session sign-out, and a clean-device malware check are sensible. It does not prove which device was affected, when collection occurred, what data was captured, or whether any password or session is still current.

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: Some infostealer collections contain session-cookie material captured at the time. The aggregate result does not show whether any session remains usable now, so signing out active sessions is a sensible precaution.
• 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 a supported public infostealer-exposure 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 Profile Crosscheck 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 the checked public source 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 a supported public infostealer-exposure 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 an aggregate infostealer signal is returned, treat it as a possible compromise. Run a reputable malware scan, sign out of active sessions on important accounts, and rotate passwords from a known-clean device. The signal does not identify a specific infected device.
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.