Splunk Web in Splunk Enterprise 6.5.x before 6.5.5, 6.4.x before 6.4.9, 6.3.x before 6.3.12, 6.2.x before 6.2.14, 6.1.x before 6.1.14, and 6.0.x before 6.0.15 and Splunk Light before 6.6.0 has Persistent XSS, aka SPL-138827.