This issue was addressed with improved checks. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave. A user that is removed from an iMessage group could rejoin the group.
References
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: apple

Published: 2021-04-02T17:56:23

Updated: 2024-08-03T16:25:04.595Z

Reserved: 2020-12-08T00:00:00

Link: CVE-2021-1771

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2021-04-02T18:15:20.700

Modified: 2021-04-12T12:01:29.893

Link: CVE-2021-1771

cve-icon Redhat

No data.