Version: (using KDE KDE 3.5.4) Installed from: SuSE RPMs It is not a bug per se, but since it is a security problem I set it to a bug status. Turn on computer, wait till KDE is loaded and you are logged in. Start new session. Look at the public user names (I have 3: me, guest and postgres -- the last is temporary). Log in as hidden user, for example root. When session is opened turn off computer. Turn it on again. Wait for KDE, start new session --> "root" is suggested by KDM.
Duplicate of https://bugs.kde.org/show_bug.cgi?id=130596, sorry I have no idea how I was able to miss it :-(