I'm a long time Plex user, and I have not received this email. Not sure if I should be worried or if the breach has just affected a subset of users.
I use random unique passwords for everything anyway, as long as no credit card
details were taken it shouldn't be a big deal hopefully.
I was able to log into the site now and no message was displayed at all.
Edit: Not sure why I would be getting down-voted for this.
Security breaches are a big deal, but if the only result of this for the users is that we need to change our passwords that's a fairly good outcome, no? :-) The biggest hurdle ahead for Plex is to figure out exactly what these attackers did, if they were directly targeted and for how long they were in their network. A lot of the times a incident is discovered it's discovered a long time after the first breach (based on my own personal experience)
Edit: Not sure why I would be getting down-voted for this. Security breaches are a big deal, but if the only result of this for the users is that we need to change our passwords that's a fairly good outcome, no? :-) The biggest hurdle ahead for Plex is to figure out exactly what these attackers did, if they were directly targeted and for how long they were in their network. A lot of the times a incident is discovered it's discovered a long time after the first breach (based on my own personal experience)