CVE-2016-4856: Cross-site scripting vulnerability in Splunk Enterprise 6.3.x prior to 6.3.5 and Splunk Light 6.3.x prior t...

Security readout for executives and security teams

This is a legacy Splunk web interface issue. An attacker who already has administrator rights could inject web script or HTML into Splunk Enterprise or Splunk Light 6.3.x before 6.3.5. The main business concern is compromised administrative browser trust inside a security monitoring platform. Exposure is most likely in old, unsupported, or forgotten Splunk Enterprise or Splunk Light 6.3 deployments. Environments already on 6.3.5 or later are not listed as affected in the supplied source bundle. The administrator-rights prerequisite limits broad external exposure. Treat this as a legacy-platform cleanup item with moderate urgency. It is not documented as actively exploited in the provided sources, but Splunk often holds sensitive operational and security data, so outdated administrative interfaces should not remain exposed. Mitigation focus: Upgrade affected Splunk Enterprise 6.3.x systems to 6.3.5 or later.; Upgrade affected Splunk Light 6.3.x systems to 6.3.5 or later.; Check current Splunk vendor guidance for supported upgrade paths..

Prepared

Jun 13, 2026, 05:01 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.