Eh, I disagree. Cryptography really isn’t something your average software engineer needs to know about, as long as they understand that you should never roll your own crypto. If you teach it in school, most students will forget the details and potentially just remember some now-insecure details from their classes.
Instead, we should be pushing for more frequent security audits. Any halfway decent security audit would catch this, and probably a bunch of other issues they have as well. Expect that from any org with revenue above some level.