Breach registry
Collection1 Data Breach
Collection #1
What was exposed, when it happened, and which databases confirm it.
- accounts
- 2,817,320,190
- Breached
- January 7, 2019
- Last Update
- January 16, 2019
Were you caught in this breach?
Search your email, phone number or username against every record CheckLeaked indexes.
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. 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.
Compromised Info
- Email addresses
- Passwords
Attestation
Four independent databases catalog this breach and they do not always agree. Each lane below is one source’s own count.
2,044,415,199 accounts DEHASHED reports beyond HIBP
Sources & Link Methods
- LeakCheck— linked via automatic string matching
- Dehashed— linked via string match to LeakCheck
- HIBP
FAQ
What was leaked in the Collection1 breach?
The Collection1 breach exposed: Email addresses and Passwords.
When did the Collection1 breach happen?
The Collection1 breach was disclosed on January 7, 2019 and affected 772,904,991 records.
Am I affected by the Collection1 breach?
Search your email, phone or username at checkleaked.cc to find out whether your data appears in the Collection1 leak.