:wave: I've been a member for a long time and I decided my leaching days are over. I finally found something to contribute !
Ok well, I came across this glitch randomly one day while exploring the alliance quarters of dalaran.
Now this isn't specifically restricted to alliance but I figure horde will have an impossibly hard time not getting ported out of the alliance side.
You need to stand on the windowsill I circled in the screenshot, It is by the alliance emblem vendors. Then you walk into the circled corner. This will make you fall through the corner and land on the roof of the inn in the sewers. If you land properly (vary your walking/jumping speed into the corner and your aim) you will land in the middle of a support beam and are able to walk into the gold vault.
You can walk right through the vault door so no worries.
Please check out the screen shots so you can understand what Im talking about.
Post any questions you may have.
Scrn shots coming in a minute.