Maybe not unintended, but definitely full access, and the world is almost certainly full of outdated/non whitelist access/weakly passworded panels.
Also, on a a sufficiently misconfigured server, you could always use \! (mysql's shell_exec, etc.) with phpmyadmin etc. to open a remote shell somewhere, then work from there.
https://en.wikipedia.org/wiki/Webmin
Maybe not unintended, but definitely full access, and the world is almost certainly full of outdated/non whitelist access/weakly passworded panels.
Also, on a a sufficiently misconfigured server, you could always use \! (mysql's shell_exec, etc.) with phpmyadmin etc. to open a remote shell somewhere, then work from there.