Cross-site scripting (XSS) vulnerability in Splunk 6.1.1 allows remote attackers to inject arbitrary web script or HTML via the HTTP Referer Header in a "404 Not Found" response. NOTE: this vulnerability might exist because of a CVE-2010-2429 regression.
https://www.exploit-db.com/exploits/40997/
https://euvd.enisa.europa.eu/vulnerability/EUVD-2014-8217
http://www.securityfocus.com/bid/67655
http://packetstormsecurity.com/files/126813/Splunk-6.1.1-Cross-Site-Scripting.html