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.
Ah, that’s unfortunate. Then yeah, I guess your best bet is to stick to a Firefox based browser (that’s my recommendation personally, I use Mull), or if you still need Chromium, I think Brave is the best option atm.
I only use Bromite at this point for some streaming stuff which don’t work so well on FF based browsers, and Mulch always pauses playback when minimised… Bloody annoying. I didn’t want to use Brave, but I guess I might have to try it.