The Cursed version is found on the remains of the dragon priest Ahzidal. A Abjuration spell must be cast on the cursed items, before they become a piece of armor.
To cleanse the cursed items drop them on the floor and zap them with the Abjuration spell. The spell can be found either on scrolls or learned from the Elder Scroll: Warlord
Additional cursed items can be acquired by summoning the Dragon priest again