Between 2016-09-22 – 2017-02-18 passwords, private messages, API keys, and other sensitive data were leaked by Cloudflare to random requesters. Data was cached by search engines, and may have been collected by random adversaries over the past few months.
Here are a list of few (Indian) sites that have been impacted – you should change your password if you are using these.
- HDFC Bank
Check the entire list (others include Digitalocean, medium and several prominent sites).