Setting this up fixed it for me

It probably is using Synapse, the Beeper github links directly to the matrix ansible script which uses Synapse by default unless you change it

Thankfully I was not subscribed to that community so I wasn’t hit by it, but wow it’s a bad situation. I will certainly be more wary and keep an eye on things, ready to purge any images just in case

+1 for MusicBrainz Picard, definitely the best tagging software out there