CVE-2018-4266: Apple iCloud

Medium severity, CVSS 5.9. EPSS: 1.8% chance of exploitation in the next 30 days.

A race condition was addressed with additional validation. This issue affected versions prior toiVersions prior to: OS 11.4.1, tvOS 11.4.1, watchOS 4.3.2, Safari 11.1.2, iTunes 12.8 for Windows, iCloud for Windows 7.6.

Affected products

• Apple iCloud: before 7.6 (fixed in 7.6)
• Apple iPhone OS: before 11.4.1 (fixed in 11.4.1)
• Apple iTunes: before 12.8 (fixed in 12.8)
• Apple Safari: before 11.1.2 (fixed in 11.1.2)
• Apple tvOS: before 11.4.1 (fixed in 11.4.1)
• Apple watchOS: before 4.3.2 (fixed in 4.3.2)

Published 2019-04-03. Last modified 2026-06-17.