The logic in place to facilitate the update process via the user interface lacks access control to verify if permission exists to perform the tasks. Prior to this patch being applied it might be possible for an attacker to access the Mautic version number or to execute parts of the upgrade process without permission. As upgrading in the user interface is deprecated, this functionality is no longer required.
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.