I am one of those emacs users who use it for everything, it always worries me the way that it could be attacked given (particularly email some how evaling some elisp or something), Despite how easy emacs would be to exploit in many aspects I do not know of any attack done on emacs either through supply chain attack (think about how many third party libs an emacs mode might use) or one of the many ways that it's no doubt possible to get emacs to eval something the user would not want it to do. If anyone knows why or if their has been an attack on emacs I would love to know.
See "The Cuckoo's Egg" [1] by Cliff Stoll (who sometimes posts here [2]). A few related HN threads: [3] [4] [5]. The book describes tracking down a hacker in 1986 who exploited a vulnerability in early Emacs' movemail utility.
[1] https://en.wikipedia.org/wiki/The_Cuckoo%27s_Egg_(book)
[2] https://news.ycombinator.com/user?id=CliffStoll
[3] https://news.ycombinator.com/item?id=21830277
[4] https://news.ycombinator.com/item?id=39843930
[5] https://news.ycombinator.com/item?id=49406713