Does Plex media server use "React" and if so do they have a fix?

Plex Media Server
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1

There is a Level 10 security issue currently being exploited with proof of concept code. Details are here: Admins and defenders gird themselves against maximum-severity server vuln - Ars Technica

Is Plex Media Server vulnerable and if so is there a fix available?

2

the server does not use it.
Player apps that do use it, do not use the react server component that has vulnerablity.
our watch.plex.tv website that uses portions had already been updated with patch