CVE-2019-8631: Apple iPhone OS

High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days.

A logic issue was addressed with improved state management. This issue is fixed in macOS Mojave 10.14.5, Security Update 2019-003 High Sierra, Security Update 2019-003 Sierra, iOS 12.3, tvOS 12.3. Users removed from an iMessage conversation may still be able to alter state.

Affected products

• Apple iPhone OS: before 12.3 (fixed in 12.3)
• Apple Mac OS X: before 10.14.5 (fixed in 10.14.5)
• Apple tvOS: before 12.3 (fixed in 12.3)

Published 2020-10-27. Last modified 2026-06-17.