What is CVE-2026-20240?

CVE-2026-20240 is a medium-severity vulnerability in Splunk, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2026-05-20.

How severe is CVE-2026-20240?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Improper input validation in Splunk

CVE-2026-20240

In Splunk Enterprise versions below 10.2.2, 10.0.5, 9.4.11, and 9.3.12, and Splunk Cloud Platform versions below 10.4.2603.1, 10.3.2512.9, 10.2.2510.11, 10.1.2507.21, 10.0.2503.13, and 9.3.2411.129, a low-privileged user that does not hold…

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.001 (17.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Splunk
Splunk Cloud Platform — versions 10.4.2603, 10.3.2512, 10.2.2510
Splunk Splunk_cloud_platform — versions 10.4.2603
Splunk Enterprise — versions 10.2, 10.0, 9.4

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

psirt@cisco.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-20240?: CVE-2026-20240 is a medium-severity vulnerability in Splunk, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2026-05-20.
How severe is CVE-2026-20240?: Medium severity. CVSS v3 base score is 6.5 out of 10.