It was found that system umask policy is not being honored when creating XDG user directories, since Xsession sources xdg-user-dirs.sh before setting umask policy. This only affects xdg-user-dirs before 0.15.5 as shipped with Red Hat Enterprise Linux.
[
{
"product": "RHEL shipped xdg-user-dirs and gnome-session",
"vendor": "Red Hat, Inc.",
"versions": [
{
"status": "affected",
"version": "before 0.15-5"
}
]
}
]