A major vulnerability in the Cloudflare proxying provider used by all sites using Cloudflare leaves all traffic vulnerable to hacking and leakage, going back for multiple months. Sites vulnerable include:
Uber
Reddit
Yelp
Digital Ocean
OKCupid
RapGenius
Coinbase
Product Hunt
Udemy
Crunchyroll
FitBit
Hacker News
Zendesk
Discord
Github pages
Chocolatey

It is recommended that you change your passwords for those sites immediately.

SOURCES:
https://bugs.chromium.org/p/project-zero/issues/detail?id=1139
https://www.reddit.com/r/sysadmin/comments/5vu3yn/cloudbleed_seceurity_bug_cloudflare_reverse/
https://blog.cloudflare.com/incident-report-on-memory-leak-caused-by-cloudflare-parser-bug/


Basically if you use any of these websites or services, change your passwords.