gdm3 versions before 3.36.2 or 3.38.2 would start gnome-initial-setup if gdm3 can't contact the accountservice service via dbus in a timely manner; on Ubuntu (and potentially derivatives) this could be be chained with an additional issue that could allow a local user to create a new privileged account.
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "gdm3-dbgsym": "3.28.3-0ubuntu18.04.6", "gir1.2-gdm-1.0": "3.28.3-0ubuntu18.04.6", "gdm3": "3.28.3-0ubuntu18.04.6", "libgdm-dev": "3.28.3-0ubuntu18.04.6", "libgdm1": "3.28.3-0ubuntu18.04.6", "libgdm1-dbgsym": "3.28.3-0ubuntu18.04.6" } ] }
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "gdm3-dbgsym": "3.36.3-0ubuntu0.20.04.2", "gir1.2-gdm-1.0": "3.36.3-0ubuntu0.20.04.2", "gdm3": "3.36.3-0ubuntu0.20.04.2", "libgdm-dev": "3.36.3-0ubuntu0.20.04.2", "libgdm1": "3.36.3-0ubuntu0.20.04.2", "libgdm1-dbgsym": "3.36.3-0ubuntu0.20.04.2" } ] }