Collection #1 — 772.9M accounts
Severity: Critical · Kind: Data breach
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From the source
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 .
Breach facts
- Accounts affected
- 772,904,991
- Verified
- No
- Sensitive
- No
- Data exposed
- Email addressesPasswords
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Plain-English summaries are AI-generated and reviewed for tone, not technical accuracy. For incident response, always rely on the original source linked above.