If you look at the series as a whole, basically everyone has admin everywhere.

There's very few situations where someone is stopped by a security protocol. Mostly things that will destroy the ship.

Heck, there was an episode where they found and unfroze a bunch of 21st century people, and Picard had to be "hey, knock it off, we don't have security locks on these things cause nobody is usually annoying enough to do this."