So, the real question is: "How much should we freak out about this?" If you scroll back a few months to Cloudbleed/Cloudflare we sort of collectively decided that because cache data containing sensitive info (passwords, tokens, whatever) might be accessible for your site using Cloudflare that everything should be revoked, force password resets, etc. Now we have this vuln, which I'll dub "IOgate" because it's the cool…
FWIW, I've found that whenever major news outlets use the "gate" postfix for anything other than Watergate, it's an indicator that they're being manipulative (it's tabloid bullshit). The certainly didn't call it Snowdengate or Trump/Russiagate.
Keep an eye out and see if you don't agree.
I deem this Clubber's Law!