Chrome was updated September 11
Matrix Element Desktop updated September 15, without a changelog or advisory. (The Element update on September 13 did not include the updated electron with the fix; today’s update does, according to their announcement on Matrix.)
Many/most electron apps don’t receive timely security updates, so if you don’t want arbitrary images to be able to get code execution you might want to stop using them.
Discord has also been using ancient electron versions for a long while now (I don’t know if they’ve since updated to versions that haven’t been EoL’ed).
On Linux, I literally have a better experience using discord in my browser than the electron version.
Edit: looks like discord updated to Electron 22 in March 2023, with the update to Electron 23 happening maybe at the end of the year or early next year, according to this reddit post. So they’re getting better, but still a bit behind.