Mattermost Security Bypass Vulnerability

Mattermost is an open source collaboration platform from Mattermost, Inc. in the United States. A security bypass vulnerability exists in Mattermost that stems from an inability to check if the “Allow users to view archived channels” setting is enabled during the permalink preview display, even if the "Allow Even if the “Allow users to view archived channels” setting is disabled, an attacker could use this vulnerability to view permalink previews for archived channels.