I haven't found any buffs that stack, with the exception of:
Buffs stating they have a Maximum Stack - These are typically only self-buffs as side-effect from other spells.
Heal Over Times.
**EDIT - I misinterpretted the question. As far as I can remember, I was able to have a Stamina Buff (casted) and a Stamina Scroll on at the same time, so it is possible other buffs from different classes that buff the same stat will stack.
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