Mattermost versions 10.0.x <= 10.0.0 and 9.11.x <= 9.11.2 fail to properly query ElasticSearch when searching for the channel name in channel switcher which allows an attacker to get private channels names of channels that they are not a member of, when Elasticsearch v8 was enabled.
{ "cpes": [ "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "cpe:2.3:a:mattermost:mattermost_server:10.0.0:-:*:*:*:*:*:*", "cpe:2.3:a:mattermost:mattermost_server:10.0.0:rc1:*:*:*:*:*:*", "cpe:2.3:a:mattermost:mattermost_server:10.0.0:rc2:*:*:*:*:*:*", "cpe:2.3:a:mattermost:mattermost_server:10.0.0:rc3:*:*:*:*:*:*", "cpe:2.3:a:mattermost:mattermost_server:10.0.0:rc4:*:*:*:*:*:*" ], "severity": "Medium" }