Well this post is a bit late 12 months to be exact! However better late than never right? This is my first CVE I've been awarded while not a super leetfinding it was still a valid 0-Day at the time.
A bit of background for those of you not aware of open redirect issues, an open redirect is a security flaw in an app or a web page that causes it to fail to properly authenticate URLs. As a result it is possible to supply arbritary links for the app to redirect to.
This issue in particular affects Oracle E-Business Suite 12.1.3/12.2.x, in order to trigger the exploit the following url can be used:
redirect parameter is vulnerable and if you supply any URL within
/\zsec.uk the page will be rendered inside of the site. Which is similar to an iframe or open redirect: