f you run Plex Media Server, it’s time to drop everything and update. The company has quietly patched a security issue that affects recent versions of its software, and users are being told to upgrade as soon as possible.
According to an email Plex sent to affected customers, versions 1.41.7.x through 1.42.0.x are vulnerable. The newly released build, 1.42.1.10060 or later, contains the fix. Plex says the flaw was found through its bug bounty program, but sadly, it has not publicly shared details about how severe the issue is or whether it could be exploited remotely.
Källa: Plex users urged to update Media Server after security flaw exposed