This issue was addressed with improved checks. This issue is fixed in iOS 13.5 and iPadOS 13.5. Users removed from an iMessage conversation may still be able to alter state.
Source: MITRE
Published: 2020-06-09
Updated: 2020-06-11
Type: NVD-CWE-noinfo
Base Score: 5
Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N
Impact Score: 2.9
Exploitability Score: 10
Severity: MEDIUM
Base Score: 7.5
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Impact Score: 3.6
Exploitability Score: 3.9
Severity: HIGH