In the RFC, the person mentions that the account he's trying to use is allowed to do GRANT to create users, so maybe he also has SELECT on the "mysql" database?

But because the value of $is_superuser is based off a SELECT on mysql.user he would have the tab for privileges

The person states

...

The problem that I have is that in Phpmyadmin, there is no easy way to modify the privileges that have been assigned etc. The entire privileges link is not shown even though the owner is able to modify database privileges.

It seems like he is trying to modify the privileges of an existing user. But, with mySQL the only way to get a list of users and to show grants (except for the user logged in) is to have SELECT on mysql.user which is what $is_superuser checks for.

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