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.
| Software | From | Fixed in |
|---|---|---|
| apple / iphone_os | - | 12.3 |
| apple / tvos | - | 12.3 |
| apple / mac_os_x | - | 10.14.5 |