The primary threat from this file is credential stuffing . Malicious actors use these lists to automate login attempts across other unrelated services (like banking or social media), exploiting the fact that many users reuse the same password across multiple accounts. "Collection #1" Data Breach - Cloud Security Alliance (CSA)
The collection primarily contains email addresses and plaintext passwords . ExLic_Collection-2019-10.rar
The total series (Collections #1–5) involved approximately 2.2 billion to 2.7 billion records and nearly 1 TB of data. The primary threat from this file is credential stuffing
It is not the result of a single hack but a "megaleak" compiled from over 2,000 different sources , including historical breaches of platforms like Yahoo , LinkedIn , and Dropbox . They were initially hosted on the cloud storage
The "Collections" were first reported in January 2019 by security researcher Troy Hunt. They were initially hosted on the cloud storage service MEGA and later distributed through various hacker forums. Contents: