What’s Vulnerable › Vulnerabilities
CVE-2026-20138: Sensitive Information Disclosure in "_internal" index in Splunk Enterprise
- Severity: medium (CVSS 4.9 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-02-18 · updated 2026-06-17
- Weakness: CWE-532
Description
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 Enterprise: from 9.2.0 before 9.2.11; from 9.3.0 before 9.3.9; from 9.4.0 before 9.4.7; from 10.0.0 before 10.0.2 — fixed in 10.0.2, 9.2.11, 9.3.9, 9.4.7
How to fix
Upgrade to a fixed version: Splunk Enterprise 10.0.2, 9.2.11, 9.3.9, 9.4.7. Check the vendor advisory for mitigations.
References
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