Plex Media Server before 1.43.3.10861 allows SSRF via '/player/timeline'. An attacker using any X-Plex-Token value can include a full URL in the 'protocol' parameter and force the Plex server to POST to the attacker's chosen destination.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 8.8%