facebook sharing also shares administrator priviledges ?

I tried the following: When logged on as Administrator I shared a product page via facebook (only to my own FB Wall in this case).

When I received the shared info and followed the link back I found myself logged in as administrator and had full access.

I hate to think what will happen if I, by accident, share in this way with the whole world.

Or am I overlooking something?

i nhave met that thing before .,but dont remember how to slove it ,when i memorize\ it ,i will .you ,how can i contact with you then.

You visited the shared product details page. But you already were logged before sharing. So it's OK. If someone else use the shared link, he'll be logged in under his own account (if he was logged in before).