A flaw was found in Spacewalk. A remote attacker can exploit a cross-site scripting (XSS) vulnerability in the Lookup Login/Password form by injecting arbitrary web script or HTML via the URI. This can lead to information disclosure or unauthorized actions within the user's browser session.
https://www.redhat.com/archives/spacewalk-announce-list/2011-December/msg00000.html
https://git.fedorahosted.org/cgit/spacewalk.git/commit/?id=890781d7ec983e32fe83af2f7c033d087292851f
https://bugzilla.redhat.com/show_bug.cgi?id=731647