CVE-2018-4190: Apple iCloud

High severity, CVSS 8.8. EPSS: 3.5% chance of exploitation in the next 30 days.

An issue was discovered in certain Apple products. iOS before 11.4 is affected. Safari before 11.1.1 is affected. iCloud before 7.5 on Windows is affected. iTunes before 12.7.5 on Windows is affected. tvOS before 11.4 is affected. The issue involves the "WebKit" component. It allows remote attackers to obtain sensitive credential information that is transmitted during a CSS mask-image fetch.

Affected products

• Apple iCloud: before 7.5 (fixed in 7.5)
• Apple iPhone OS: before 11.4 (fixed in 11.4)
• Apple iTunes: before 12.7.5 (fixed in 12.7.5)
• Apple Safari: before 11.1.1 (fixed in 11.1.1)
• Apple tvOS: before 11.4 (fixed in 11.4)
• Canonical Ubuntu Linux: version 16.04 only; version 17.10 only; version 18.04 only

Published 2018-06-08. Last modified 2026-06-17.