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.
That’s not really well defined on Linux. It feels like every application comes with its own toolkit and its own behavior. Even on Windows, there is a mixture of three different generations of Windows UI systems (Windows XP-style, Windows 8-style, Fluent) that are completely different.