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CVE-2026-20166: Sensitive Information Disclosure in Discover Splunk Observability Cloud app for Splunk Enterprise

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-11 · updated 2026-06-17
• Weakness: CWE-200

Description

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 Enterprise: from 10.0.0 before 10.0.4; 10.2.0 — fixed in 10.0.4
• Splunk Cloud Platform: from 10.0.2503 before 10.0.2503.12; from 10.1.2507 before 10.1.2507.16; from 10.2.2510 before 10.2.2510.5 — fixed in 10.0.2503.12, 10.1.2507.16, 10.2.2510.5

How to fix

Upgrade to a fixed version: Splunk Enterprise 10.0.4; Splunk Cloud Platform 10.0.2503.12, 10.1.2507.16, 10.2.2510.5. Check the vendor advisory for mitigations.

References

• https://advisory.splunk.com/advisories/SVD-2026-0305

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