Searched for something like this and cannot find any posts Much easier way to get under org, Found this 3.3.3 while playing.... hide and seek.... o_O
You will need a fairly large mount. I used the black war bear in my attempt, my zhevra did not work. It's alot like the wintergrasp fortress exploit, Same principles.
Go outside the guild master house in the valley of strength.
Drop down where it shows on the above picture.
Go into the left corner of where it says on this picture
When in the corner, get as far in as you can. Mount up on a larger than life mount. Run and jump at the same time until you fall to the ground of org. The below picture shows what happened to my camera once I had mounted.
You may be disallowed to mount, I only got this once and after another try it let me mount. Also you may fall into the shop below, Just try again and aim more to the right next time.
Do as the picture says