When a person reuses the same password across multiple accounts, one account’s exposure puts all the others at risk. Every year numerous publications list the top 10, 20, 100 passwords used in the previous year. For example, in 2020 more than 2.5 million people used the password ‘123456’ Lists of popular passwords are used by hackers to script ‘ or brute-force ‘ logins to gain access. Multifactor authentication (MFA), cybersecurity education, password manager programs, proper configuration and enhanced password screening tools all help mitigate bad habits that plague our digital lives.
Source: https://www.helpnetsecurity.com/2021/03/15/password-reuse/