Preheat your oven to 325 degrees. Place 24 cupcake liners in cupcake pans.
In a large bowl, combine cake mix, water, eggs, oil, pumpkin and cinnamon. Once all ingredients are combined, mix on medium speed for two minutes.
Fill cupcake liners with batter.
Bake for 17-22 minutes or until tops spring back lightly when touched.
Remove from oven and let cool on rack.
Frost with frosting of choice.