Passwords entered in GDM can be displayed when switching TTYs

Ubuntu 18.04.1 LTS

gdm3:
  Installed: 3.28.2-0ubuntu1.4
  Candidate: 3.28.2-0ubuntu1.4
  Version table:
 *** 3.28.2-0ubuntu1.4 500
        500 http://us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
        100 /var/lib/dpkg/status
     3.28.0-0ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages

When switching between TTYs or sessions via the Alt+Function keybindings, you can briefly display all entered passwords from the GDM password box. When I was switching from a TTY to my active GNOME Shell session, I accidentally pressed `Alt`+`F1`+`F2` at the same time instead of just `Alt`+`F2`, and when I did this, a black screen with text appeared for a second or so that displayed everything that had been entered into the GDM password box, regardless of which user it was. I believe this may be problematic on multi-user systems. I tried to take a picture but the quality is subpar as I had to handle the camera and press the keys at the same time to capture ( https://photos.app.goo.gl/8k5voYWcvK424xp59 ) The intentionally blurred area is where the passwords/entered text was shown.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gdm3 3.28.2-0ubuntu1.4
Uname: Linux 4.18.7-041807-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.3
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon Sep 17 05:12:33 2018
InstallationDate: Installed on 2018-09-15 (2 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gdm3
UpgradeStatus: No upgrade log present (probably fresh install)