CVE-2024-6428 Limited DoS due to permitting creating users with user-defined IDs

Mattermost versions 9.8.0, 9.7.x = 9.7.4, 9.6.x = 9.6.2, 9.5.x = 9.5.5 fail to prevent specifying a RemoteId when creating a new user which allows an attacker to specify both a remoteId and the user ID, resulting in creating a user with a user-defined user ID. This can cause some broken...