CVE-2026-20240: Splunk

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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 the ‘admin’ or ‘power’ Splunk roles could cause a Denial of Service by exploiting the `coldToFrozen.sh` script in the `splunk_archiver` app to rename critical Splunk directories, making the instance non-functional.<br><br>The Denial of Service is possible because of missing input validation in the `coldToFrozen.sh` script, which accepts arbitrary file paths and renames them without restricting operations to safe directories.

Affected products

• Splunk Splunk: from 9.3.0, before 9.3.12 (fixed in 9.3.12); from 9.4.0, before 9.4.11 (fixed in 9.4.11); from 10.0.0, before 10.0.5 (fixed in 10.0.5); from 10.2.0, before 10.2.2 (fixed in 10.2.2)
• Splunk Splunk Cloud Platform: from 9.3.2411, before 9.3.2411.129 (fixed in 9.3.2411.129); from 10.0.2503, before 10.0.2503.13 (fixed in 10.0.2503.13); from 10.1.2507, before 10.1.2507.21 (fixed in 10.1.2507.21); from 10.2.2510, before 10.2.2510.11 (fixed in 10.2.2510.11); from 10.3.2512, before 10.3.2512.9 (fixed in 10.3.2512.9); version 10.4.2603 only

Published 2026-05-20. Last modified 2026-07-23.