Step-by-step instructions on how to reproduce the problem:
It was found the application is vulnerable to XSS attack. To achieve the same,
open this link http://staging.jsdelivr.net/g//%3Cimg/src=%22%3E%22+onerror=alert%28927942%29%3E
it can't prompt bcoz there is nothng just some code that's why it's can't prompt. but when u write something there it will prompt.
Regard Shubham Gupta