I dont know is this repost and its not so big exploit but this one is not easy to track as long as you dont use it too much.
Everyone knows that when you equip 2h with stats like strenght,stamina and agility, and when you equip 1h and switch back to 2h those stats are lower.
Now comes that stamina part. Corrupted ashbringer (Thottbot World of Warcraft: Corrupted Ashbringer) has -25 stamina as stat so when you equip it and then 1h,then equip ashbringer again,then 1h over and over again your stamina goes up by 25 every time. You can use this easily without being noticed if you have only around 2-3k more hp than others.
Edit: topic should say 2h sword