Of course, Santa has an official bio in the DC Database:
Powers
Charisma: With the exception of notable individuals such as Lobo and the Easter Bunny, Santa Claus has the ability to engender trust and inspire hope in others.
Immortality: Santa Claus appears to be virtually immortal, having not aged beyond his traditional image for several centuries.
Magic: Santa is stated to have magical powers, though the exact nature of this is unknown. The Prime Earth version is a powerful wizard, capable of hiding entire cities in ice. But he wasn't powerful enough to stand against the likes of Black Adam.[2]
Cryokinesis[2]
Abilities
Artistry: Santa is known for being a toy maker.[9]
Firearms