Updated flatpak packages fix security vulnerability:
A sandbox escape in the flatpak dbus proxy in the authentication phase (CVE-2018-6560).
The flatpak has been upgraded to the latest stable version, 0.10.3, which fixes this issue. The bubblewrap, ostree, flatpak-builder, xdg-desktop-portal, xdg-desktop-portal-gtk, and appstream-glib packages have also been upgraded to support this updated.