It “seems" it would be an easy fix. According to the original poster it says he alerted the development team.
I searched the archive and maybe he private messaged a couple developers?
https://www.cvedetails.com/cve/CVE-2019-12922/ https://www.cvedetails.com/cve/CVE-2019-12922/
https://seclists.org/fulldisclosure/2019/Sep/23 https://seclists.org/fulldisclosure/2019/Sep/23
The bug would have very low probability of exploit. You would have to be logged into an existing phpmyadmin session and simultaneously trick the user to click on a link while in the setup stage.
Thought I would post here that the bug is publicly posted.
Thanks, Todd
P.S. Enjoy phpmyadmin. Been using it off and on over a decade.