Apache Guacamole 1.3.0 and older may incorrectly include a private tunnel identifier in the non-private details of some REST responses. This may allow an authenticated user who already has permission to access a particular connection to read from or interact with another user's active use of that same connection.
{
    "severity": "Medium",
    "cpes": [
        "cpe:2.3:a:apache:guacamole:*:*:*:*:*:*:*:*"
    ]
}