They don't need to have one.
You can report it here: https://cveform.mitre.org/
Use the CNA-LR since I don't think they have a CNA.
You were probably trying to do the right thing disclosing, just know that there is a better process for it (even if you think the devs are asshats, it's good to do it like that for the community who aren't).
Even if it only affects admins, that includes admins of forks etc.
I'm sure there's probably more vulnerabilities to find.
I don't think the "companies making ready-to-drink coffee products at industrial scale" that article is talking about this being designed for are running a 1500 watt appliance for 15 minutes a day.
They're thinking more that factories won't need to use traditional extractors which generally need to heat stuff to high temperatures to make coffee milk drinks and soluble instant coffee, etc.