I'm using the last LTS Tikiwiki version (18.1) on Apache 2.2/PHP 5.6/Mysql 5.5.
I configured Tikiwiki with "Web server" authentication method.
Using Firefox (no problems with Chrome), when I logout from Tikiwiki, the browser alert me with this popup:
"You are about to log in to the site "ww.example.com" with the username "admin", but the website does not require authentication. This may be an attempt to trick you.
Is "www.example.com" the site you want to visit?"
Looking at code, I found this suspect line (336) of "lib/userslib.php" :
header('Location: ' . str_replace('//', '//admin:@', $url)); // simulate a fake login to logout the user
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