In Safari before 11.1.2, iTunes before 12.8 for Windows, iOS before 11.4.1, tvOS before 11.4.1, iCloud for Windows before 7.6, sound fetched through audio elements may be exfiltrated cross-origin. This issue was addressed with improved audio taint tracking.
https://usn.ubuntu.com/3743-1/
https://support.apple.com/HT208938%2C
https://support.apple.com/HT208936%2C
https://support.apple.com/HT208934%2C
https://support.apple.com/HT208933%2C
https://support.apple.com/HT208932
https://security.gentoo.org/glsa/201808-04