CVE-2026-20166: Splunk

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

In Splunk Enterprise versions below 10.2.1 and 10.0.4, and Splunk Cloud Platform versions below 10.2.2510.5, 10.1.2507.16, and 10.0.2503.12, a low-privileged user that does not hold the "admin" or "power" Splunk roles could retrieve the Observability Cloud API access token through the Discover Splunk Observability Cloud app due to improper access control. This vulnerability does not affect Splunk Enterprise versions below 9.4.9 and 9.3.10 because the Discover Splunk Observability Cloud app does not come with Splunk Enterprise.

Affected products

• Splunk Splunk: from 10.0.0, before 10.0.4 (fixed in 10.0.4); version 10.2.0 only
• Splunk Splunk Cloud Platform: from 10.0.2503, before 10.0.2503.12 (fixed in 10.0.2503.12); from 10.1.2507, before 10.1.2507.16 (fixed in 10.1.2507.16); from 10.2.2510, before 10.2.2510.5 (fixed in 10.2.2510.5)

Published 2026-03-11. Last modified 2026-06-17.