The security company paid by Dominion to certify that their machines were unhackable, as mentioned in the article.
I did read the article, albeit poorly as I must have: skipped past that section by mistake -or- read it while distracted but either way MITRE seemed brand new to me when I read it in the comment.
A not-for-profit organization that does research and analysis of stuff, especially security and defense stuff.
The guardians of the CVE database among other things.