CVE-2018-4113: Apple iCloud

Medium severity, CVSS 6.5. EPSS: 2.1% chance of exploitation in the next 30 days.

An issue was discovered in certain Apple products. iOS before 11.3 is affected. Safari before 11.1 is affected. iCloud before 7.4 on Windows is affected. iTunes before 12.7.4 on Windows is affected. tvOS before 11.3 is affected. watchOS before 4.3 is affected. The issue involves a JavaScriptCore function in the "WebKit" component. It allows attackers to trigger an assertion failure by leveraging improper array indexing.

Affected products

• Apple iCloud: before 7.4 (fixed in 7.4)
• Apple iPhone OS: before 11.3 (fixed in 11.3)
• Apple iTunes: before 12.7.4 (fixed in 12.7.4)
• Apple Safari: before 11.1 (fixed in 11.1)
• Apple tvOS: before 11.3 (fixed in 11.3)
• Apple watchOS: before 4.3 (fixed in 4.3)
• Canonical Ubuntu Linux: version 16.04 only; version 17.10 only
• WebKitGTK Webkitgtk+: before 2.20.4 (fixed in 2.20.4)

Published 2018-04-03. Last modified 2026-06-17.