An issue was discovered in certain Apple products. iOS before 10.1 is affected. macOS before 10.12.1 is affected. tvOS before 10.0.1 is affected. watchOS before 3.1 is affected. The issue involves the "libxpc" component. It allows attackers to execute arbitrary code in a privileged context via a crafted app.
https://support.apple.com/HT207275
https://support.apple.com/HT207271
https://support.apple.com/HT207270
https://support.apple.com/HT207269