When searching on eBay I found out that it's possible execute a XSS vulnerability on their job search section.
Proof of concept:
On Ebay Careers, you clicked on the Search Openings and on the Requisition No. you wrote the XSS vector:
<img src=x onerror=prompt("xss");>
Clicked Search. The following screen doesn't execute the XSS but when you click:
?more...it would open a new window with the XSS executing.
This issue has been fixed and some pages removed.
I want to thank eBay security team for the fast reply and putting me on their Security Researchers Acknowledgment page. By the way, I'm the first portuguese guy in the list...