I already have a CMX title, will I lose it if I don't pass in another edition of the CMX Level 3 exam?

You will not lose your CMX title if you don’t pass another CMX level 3 exam, so long as you have received your CMX title within the last two years. Your CMX title will expire two years after the date in which you received your CMX results by email, unless you pass another CMX Level 3 exam before the expiration date.