What is CVE-2026-20259?

CVE-2026-20259 is a medium-severity vulnerability in Splunk, classified under Improper Access Control. CVSS score: 5.5/10. Published 2026-06-10.

How severe is CVE-2026-20259?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Splunk

CVE-2026-20259

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-pr…

EPSS: 0.002 (8.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:N.

Affected products

Splunk
Splunk Cloud Platform — versions 10.3.2512, 10.2.2510, 10.1.2507
Splunk Splunk_cloud_platform
Splunk Enterprise — versions 10.2, 10.0

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

psirt@cisco.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-20259?: CVE-2026-20259 is a medium-severity vulnerability in Splunk, classified under Improper Access Control. CVSS score: 5.5/10. Published 2026-06-10.
How severe is CVE-2026-20259?: Medium severity. CVSS v3 base score is 5.5 out of 10.