A vulnerability was discovered and fixed in the windows version of Apple Bootcamp is being applied to Apple machines (which operate on different versioning and dont have the same version available)https://support.apple.com/en-gb/HT212517
As far as I am aware, the version I currently have installed is the latest as provided by Apple (across our whole Mac estate). Are you able to confirm which Apple update/installer includes the version Flexera is detecting?