Disney says
Angus Beef Patty with American Cheese, and Lettuce on an Allergy-friendly Bun and served with choice of Mixed Fruit or French Fries.
Friendliest.app says
The cheeseburger can be served on an allergy-friendly bun that is free of gluten/wheat, dairy/milk, fish, shellfish, peanuts, tree nuts and soy.

French fries are fried in a dedicated fryer to reduce cross-contamination.

This meal contains milk/dairy (cheese), eggs (bun) and soy (french fries). It can be made soy-friendly by selecting the mixed fruit instead of french fries.

If ordered with the house burger sauce, this meal may also contain wheat/gluten, milk/dairy eggs and soy.