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Breach occurred 2019-01-07What 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. The data contained almost 2.7 billion records including 773 million unique email addresses alongside passwords those addresses had used on other breached services. Full details on the incident and how to search the breached passwords are provided in the blog post The 773 Million Record "Collection #1" Data Breach.
Data exposed
Frequently asked questions
The Collection #1 data breach occurred on January 7, 2019. It was added to Have I Been Pwned's breach catalog on January 16, 2019.
772,904,991 accounts were affected by the Collection #1 data breach, according to Have I Been Pwned's records.
The Collection #1 breach exposed the following data types: Email addresses, Passwords.
Have I Been Pwned has not independently verified the Collection #1 breach. Unverified breaches can still be genuine — verification just means HIBP hasn't been able to confirm the data's authenticity directly, often because the source is a smaller or less-publicized incident.
Use KazaSec's free Email Breach Checker (/tools/breach-check) to check whether a specific email address has surfaced in the Collection #1 breach, or any other known breach — the tool never stores what you search.
Our free Email Breach Checker tells you whether a specific email address has surfaced in this breach — or any other known breach — without ever storing what you search.
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