Collection #1 data breach

Risk level: Medium 32/100

What happened

In January 2019, a large collection of credential stuffing lists (combinations of email addresses and passwords used to hijack accounts on other services) was discovered being distributed on a popular hacking forum.

Breach date: 7 January 2019
Date added: 16 January 2019
Compromised accounts: 772,904,991
Domain: —

Compromised data

Email addresses
Passwords

Breach attributes

Unverified

Recommended steps if you were in the Collection #1 breach:

Security remediation checklist

Work through these steps, most urgent first:

Change the password on every affected site immediately, and anywhere you reused it.
Sign out of all sessions and revoke app passwords, API keys and connected apps.
Turn on two-factor authentication (authenticator app or security key) wherever it is offered.
Use a unique password for every site so one breach cannot unlock other accounts.
Use a password manager to generate and store strong, unique passwords.
Expect targeted phishing emails that mention this breach. Do not click unexpected links.
Keep an eye on your accounts for logins or changes you do not recognise.
Subscribe to breach alerts so you hear about future breaches quickly.