Twitter warns that due to a bug Password, it temporarily stored unencrypted in internal logs. Although the service has no indications that the logs have been accessed by unauthorized persons, the advice is that every user must change their password.

Twitter reports to have detected the bug ‘recently’. The service does not report how many Passwords were stored unencrypted and how long they were in the internal logs as such. Twitter recently announced a total of 267 million monthly active users.

Because Twitter has no indications that its servers have been invaded by unauthorized people or that the logs have been misused, the service has not given any reset passwords. As a precautionary measure, the company advises users to ‘consider’ their passwords, even in services where they use the same password, should that be the case.

Twitter did the communication Thursday night. The first Thursday of May has been proclaimed Password Day by some parties, to make people aware of having a good password policy.