On the 02.12.2017 security researcher reported a XSS vulnerability affecting the vulnerable.hitsteps.com website via the Open Bug Bounty coordinated vulnerability disclosure program.
Vulnerability submitted via Open Bug Bounty| 2 December, 2017 13:25 GMT
Generic security notifications sent to website owner| 2 December, 2017 13:27 GMT
Notification sent to subscribers (without technical details)| 2 December, 2017 14:17 GMT
If you are the website owner or administrator please contact the researcher directly to get vulnerability details and proceed to coordinated disclosure.