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Cyber Security
Credential Stuffing Explained
Daniel Okoro · Security Writer, SecureTempMail 5 min read
If you reuse passwords, one breach can unlock dozens of your accounts. That attack is called credential stuffing.
The mechanics
After a breach, attackers get millions of email/password pairs. Bots try those exact pairs on banks, shops, and email providers, betting that people reuse passwords. They're usually right.
How to be immune
- Unique passwords per site (a manager makes this painless).
- 2FA or passkeys so a password alone is useless.
- Disposable addresses for low-trust sites, so a leak there isn't tied to your main accounts — start here.
The mindset
Assume every password will eventually leak. Design so that when it does, the damage is contained to one account.