A reflected cross-site scripting vulnerability in the OAuth flow completion endpoints in Mattermost allows an attacker to send AJAX requests on behalf of the victim via sharing a crafted link with a malicious state parameter.
{
    "severity": "Medium",
    "cpes": [
        "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*"
    ]
}