A gdm security update has been released for Fedora 33.

SECURITY: Fedora 33 Update: gdm-3.38.2.1-1.fc33

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Fedora Update Notification
FEDORA-2020-1650d8012f
2020-12-22 01:28:31.149550
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Name : gdm
Product : Fedora 33
Version : 3.38.2.1
Release : 1.fc33
URL :   https://wiki.gnome.org/Projects/GDM
Summary : The GNOME Display Manager
Description :
GDM, the GNOME Display Manager, handles authentication-related backend
functionality for logging in a user and unlocking the user's session after
it's been locked. GDM also provides functionality for initiating user-switching,
so more than one user can be logged in at the same time. It handles
graphical session registration with the system for both local and remote
sessions (in the latter case, via the XDMCP protocol). In cases where the
session doesn't provide it's own display server, GDM can start the display
server on behalf of the session.

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Update Information:

gdm 3.38.2.1 release: - Address autologin unlock bug issue (CVE-2020-27837) -
Translation updates
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ChangeLog:

* Sat Dec 19 2020 Kalev Lember - 1:3.38.2.1-1
- Update to 3.38.2.1
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References:

[ 1 ] Bug #1906812 - CVE-2020-27837 gdm: lock screen bypass when autologin is set
  https://bugzilla.redhat.com/show_bug.cgi?id=1906812
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2020-1650d8012f' at the command
line. For more information, refer to the dnf documentation available at
  http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label

All packages are signed with the Fedora Project GPG key. More details on the
GPG keys used by the Fedora Project can be found at
  https://fedoraproject.org/keys