There are a host of ways to get from CDG to Paris or EuroDisney, but you may want to consider The TVG!
At a speed of near 200 MPH, you can go from CDG to EuroDisney in 12 MINUTES! The prices start at 15 Euros. After a long flight, and the potential problems at CDG, The
TVG may be the way to go! (You can Google RER Paris, and get all the information!)
You can always just take The RER, but you will have to change trains at Les Halles.
Since your time is so limited, The TVG would be a wonderful experience. It is coming from London or Brussels!
Here's a photo I took at the Eurostar Board at EuroDisney
You will find directions easy, once you get to the EuroDisney Station!
The grounds outside the station are clean and that EuroDisney a short walk away!
The atmosphere is "Festive"! Book your arrangements early!
If you are "Crazy" you might rent a car at the station and drive to Paris! My suggestion "Don't!"
This is the RER train you will want to take from EuroDisney to La Defense, it is clean, effective, and if you may want to get your RER pass here, and that way you won't have to pay for The RER while you are enjoying Disney!
Sit back and enjoy the roughly one hour ride on the RER from EuroDisney to La Defense!
Hope this helps!
Will have the information for La Defense to Versailles for you shortly!