This sounds like it may be related to the recent attacks on git repos. See if you have a repository somewhere with a git remote that contains your (old) username and password in the remote URL itself.
My Atlassian password is already changed, and in my local repos that I work with, so I can do pulls and pushes.
If I understand correctly If it is related to recent attacks, I can do nothing about the fact that attackers still use my old password and I will receive this message independently of what I do. That's a bit annoying.
