This type of tool has been around for a little while in the PS4 scene, but what sets the Xbox One tool apart, is that it isn't run by a bunch of lamers trying to earn as much as they can off gullible cheaters, here is a quote from the source:
The first Xbox One game save modding tool is finally out. After months of research and development we’re glad to give you the first taste of what it’s like to mod games on your Xbox One
- Access your game saves without a flash drive!
- Mod Modern Warfare: Remastered game saves in campaign mode.
- COMING SOON: Storage Explorer