Troy Hunt security researcher has discovered a huge leak with 773 million emails and 21 million passwords released, which is called Collection # 1. Hunt said that someone had told him about 12,000 files with 87GB, including 2.7 billion lines, uploaded to MEGA. These files are now removed by MEGA but still exist on hacker forums. Hunt added posts on the forum indicating that this is aggregated data from more than 2000 databases. This is one of the biggest information leaks ever recorded.
Hunt has made a website called https://haveibeenpwned.com for you to check your email Whether or not it is in the list of password leaks. Not only is this database leaked on this page, but also in other cases. If the email is finished and the red part of the email is found and your password has been leaked on one or more pages, the blue color is ok.
Have I Been Pwned: Check if your email has been compromised in a data breach
Have I Been Pwned allowing you to search across multiple data breaches to see if địa chỉ email của bạn đã được phân vùng
Currently the best way is to change your email password and other services that share the same password. Also, it is recommended to set up 2-layer security for important accounts as well as email.
Source: The Next Web