If a security vulnerability is known in Contao or in one of the installed packages and has been closed in a new version, you will receive an email notification from us (if you have activated this in Profile > Settings > Notifications). Within trakked, an additional label "Security risk" appears, with which you can find all affected installations. Furthermore, you can recognise by the red trakked logo that there is a security problem with this installation.
If you then open the detailed view of an installation, a new tab "Security" appears. Here you can see the affected packages and a short description of the security gap. If available, you can find out more details by clicking on the link button.