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://exchange.xforce.ibmcloud.com/vulnerabilities/146479
https://security.gentoo.org/glsa/201808-04
https://support.apple.com/HT208932
https://support.apple.com/HT208933,
https://support.apple.com/HT208934,
https://support.apple.com/HT208936,
https://support.apple.com/HT208938,