CVE-2026-20138: Splunk

Medium severity, CVSS 4.9. EPSS: 0.3% chance of exploitation in the next 30 days.

In Splunk Enterprise versions below 10.2.0, 10.0.2, 9.4.7, 9.3.9, and 9.2.11, a user of a Splunk Search Head Cluster (SHC) deployment who holds a role with access to the Splunk `_internal` index could view the `integrationKey`, `secretKey`, and `appSecretKey` secrets, generated by [Duo Two-Factor Authentication for Splunk Enterprise](https://duo.com/docs/splunk), in plain text.

Affected products

• Splunk Splunk: from 9.2.0, before 9.2.11 (fixed in 9.2.11); from 9.3.0, before 9.3.9 (fixed in 9.3.9); from 9.4.0, before 9.4.7 (fixed in 9.4.7); from 10.0.0, before 10.0.2 (fixed in 10.0.2)

Published 2026-02-18. Last modified 2026-06-17.