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CVE-2026-20259: Improper Access Control in Splunk Enterprise

• Severity: medium (CVSS 5.5 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: 2026-06-10 · updated 2026-06-17
• Weakness: CWE-284

Description

In Splunk Enterprise versions below 10.2.4 and 10.0.7, and Splunk Cloud Platform versions below 10.4.2604.0, 10.3.2512.12, 10.2.2510.15, 10.1.2507.23, 10.0.2503.14, and 9.3.2411.131, a user who holds a Splunk role that contains the high-privilege capability `edit_saved_search_owner` could reassign saved search ownership to users outside their authorized scope. The ownership reassignment endpoint lacks access control.

Affected products

• Splunk Enterprise: from 10.0.0 before 10.0.7; from 10.2.0 before 10.2.4 — fixed in 10.0.7, 10.2.4
• Splunk Cloud Platform: from 9.3.2411 before 9.3.2411.131; from 10.0.2503 before 10.0.2503.14; from 10.1.2507 before 10.1.2507.23; from 10.2.2510 before 10.2.2510.15; from 10.3.2512 before 10.3.2512.12 — fixed in 10.0.2503.14, 10.1.2507.23, 10.2.2510.15, 10.3.2512.12, 9.3.2411.131

How to fix

Upgrade to a fixed version: Splunk Enterprise 10.0.7, 10.2.4; Splunk Cloud Platform 10.0.2503.14, 10.1.2507.23, 10.2.2510.15, 10.3.2512.12. Check the vendor advisory for mitigations.

References

• https://advisory.splunk.com/advisories/SVD-2026-0609

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