What’s Vulnerable › Vulnerabilities

CVE-2018-4266

• Severity: medium (CVSS 5.9 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-04-03 · updated 2026-06-17
• Weakness: CWE-362

Description

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 for Windows: before 7.6 — fixed in 7.6
• Apple Iphone Os: before 11.4.1 — fixed in 11.4.1
• Apple iTunes for Windows: 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

How to fix

Upgrade to a fixed version: Apple iCloud for Windows 7.6; Apple Iphone Os 11.4.1; Apple iTunes for Windows 12.8; Apple Safari 11.1.2; Apple tvOS 11.4.1; Apple watchOS 4.3.2. Check the vendor advisory for mitigations.

References

• https://support.apple.com/kb/HT208932
• https://support.apple.com/kb/HT208933
• https://support.apple.com/kb/HT208934
• https://support.apple.com/kb/HT208935
• https://support.apple.com/kb/HT208936
• https://support.apple.com/kb/HT208938
• https://support.apple.com/kb/HT208932
• https://support.apple.com/kb/HT208933
• https://support.apple.com/kb/HT208934
• https://support.apple.com/kb/HT208935
• https://support.apple.com/kb/HT208936
• https://support.apple.com/kb/HT208938

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