A 'data breach' on its own isn't always a crisis — but it tells you exactly which credentials and personal details are now circulating. The first job is to stop guessing and find out what's actually out there.
What to look up
- Every email address you use (including aliases and old addresses)
- Phone numbers — a growing number of breaches expose mobile numbers
- Reused passwords — one leaked password can unlock dozens of accounts
Why this matters
Credential-stuffing attacks use exactly these dumps to log into your other accounts. The faster you know what's out, the faster you can change the right things.
Tip
If your password manager has a built-in breach scanner (1Password Watchtower, Bitwarden Reports, Proton Pass Monitor, Apple Passwords), run it now too — it cross-checks every saved password.
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JD
Written by
Jordan DicksonFounder, CyberSecurityGuides
Founder of CyberSecurityGuides, writing practical, jargon-free guides that help everyday people recover from and protect against online attacks.
Reviewed by CSG Security Engineers