CVE-2026-20204: Splunk

High severity, CVSS 7.1. EPSS: 3.1% chance of exploitation in the next 30 days.

In Splunk Enterprise versions below 10.2.1, 10.0.5, 9.4.10, and 9.3.11, and Splunk Cloud Platform versions below 10.4.2603.0, 10.3.2512.5, 10.2.2510.9, 10.1.2507.19, 10.0.2503.13, and 9.3.2411.127, a low-privileged user that does not hold the `admin` or `power` Splunk roles could potentially perform a Remote Code Execution (RCE) by uploading a malicious file to the `$SPLUNK_HOME/var/run/splunk/apptemp` directory due to improper handling and insufficient isolation of temporary files within the `apptemp` directory.

Affected products

• Splunk Splunk: from 9.3.0, before 9.3.11 (fixed in 9.3.11); from 9.4.0, before 9.4.10 (fixed in 9.4.10); from 10.0.0, before 10.0.5 (fixed in 10.0.5); version 10.2.0 only
• Splunk Splunk Cloud Platform: from 9.3.2411, before 9.3.2411.127 (fixed in 9.3.2411.127); from 10.0.2503, before 10.0.2503.13 (fixed in 10.0.2503.13); from 10.1.2507, before 10.1.2507.19 (fixed in 10.1.2507.19); from 10.2.2510, before 10.2.2510.9 (fixed in 10.2.2510.9); from 10.3.2512, before 10.3.2512.5 (fixed in 10.3.2512.5)

Published 2026-04-15. Last modified 2026-06-17.