Disney says
Two Angus Beef Patties, Cheddar Cheese, Lettuce, Tomato, Pickle Slices, Grilled Onions and SJG Burger Sauce served on an Allergy-Friendly Bun with Crinkle-Cut Fries or Cuties® Mandarin Oranges.
Friendliest.app says
The Double Cheeseburger is free of gluten/wheat, fish, shellfish, peanuts and tree nuts.

Crinkle-Cut Fries are fried in a dedicated fryer to reduce cross-contamination.

This meal contains milk (cheese), eggs (bun) and soy (fries).

This meal can be made milk allergy-friendly by omitting the Cheese and ordering as the
Allergy-Friendly Double Hamburger.

It can be made soy allergy-friendly by selecting Cuties instead of Waffle-cut Fries.

Note: The cheeseburger can be made egg-friendly by ordering on a standard bun, but introduces other allergens.