The National CERT of the Republic of Serbia (SRB-CERT) is informing and warning all Twitter users to change their passwords after a bug expose them in plain text. If not your account can be misused. Apparently, passwords were being saved in plain text, instead of masking them in with the hashing process. Twitter claims that they have found the bug and removed all passwords immediately. There is no official statement regarding how many passwords were exposed before they found and fixed this issue.
National CERT recommends password change to all Twitter users in order to avoid any kind of misuse of their account.

For more details, please visit https://www.theverge.com/2018/5/3/17316684/twitter-password-bug-security-flaw-exposed-change-now.