Anti Public Combo List
What Happened
In December 2016, a huge list of email address and password pairs appeared in a "combo list" referred to as "Anti Public". The list contained 458 million unique email addresses, many with multiple different passwords hacked from various online systems. The list was broadly circulated and used for "credential stuffing", that is attackers employ it in an attempt to identify other online systems where the account owner had reused their password. For detailed background on this incident, read Password reuse, credential stuffing and another billion records in Have I Been Pwned.
Compromised Data
Recommended Actions
Change Your Password
If you haven't changed your password on this service since the breach, do so immediately.
Enable Two-Factor Authentication
If 2FA is supported, add an extra layer of security to your account.
Check Other Accounts
If you used the same password elsewhere, change those too.
Monitor for Suspicious Activity
Watch for unusual login attempts, spam and phishing emails.
Breach Overview
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Affected Accounts:
458 million
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Breach Occurred:
December 2016
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Added to HIBP:
4 May 2017
Breach Classification
Some breaches may be flagged as "unverified". In these cases, whilst there is legitimate data within the alleged breach, it may not have been possible to establish legitimacy beyond reasonable doubt.
Unverified breaches are still included in the system because regardless of their legitimacy, they still contain personal information about individuals who want to understand their exposure on the web.
Recommended Actions
Change Your Password
If you haven't changed your Anti Public Combo List password since 2016, do so immediately.
Enable Two-Factor Authentication
Add an extra layer of security to your account.
Check Other Accounts
If you used the same password elsewhere, change those too.
Monitor for Suspicious Activity
Watch for unusual login attempts or messages from your account.
