CVE-2018-4478: Apple Mac OS X

Medium severity, CVSS 6.8. EPSS: 0.3% chance of exploitation in the next 30 days.

A validation issue was addressed with improved logic. This issue is fixed in macOS High Sierra 10.13.5, Security Update 2018-003 Sierra, Security Update 2018-003 El Capitan. An attacker with physical access to a device may be able to elevate privileges.

Affected products

• Apple Mac OS X: before 10.13.5 (fixed in 10.13.5); from 10.11, before 10.11.6 (fixed in 10.11.6); from 10.12, before 10.12.6 (fixed in 10.12.6); version 10.11.6 only; version 10.12.6 only

Published 2021-12-23. Last modified 2026-06-17.