CVE-2026-20251: Splunk

High severity, CVSS 8.8. EPSS: 32.2% chance of exploitation in the next 30 days.

In Splunk Enterprise versions below 10.2.4, 10.0.7, 9.4.12, and 9.3.13, Splunk Cloud Platform versions below 10.3.2512.12, 10.2.2510.14, 10.1.2507.22, and 9.3.2411.132, and Splunk Secure Gateway versions below 3.10.6, 3.9.20, and 3.8.67, a low-privileged user that does not hold the 'admin' or 'power' Splunk roles could perform a Remote Code Execution (RCE) through the Splunk Secure Gateway app.<br><br>The Remote Code Execution is possible because of unsafe deserialization of App Key Value Store (KV Store) data through the ‘jsonpickle’ Python library, which reconstructs arbitrary Python objects from specially crafted JavaScript Object Notation (JSON) without adequate validation.

Affected products

• Splunk Splunk: from 9.3.0, before 9.3.13 (fixed in 9.3.13); from 9.4.0, before 9.4.12 (fixed in 9.4.12); from 10.0.0, before 10.0.7 (fixed in 10.0.7); from 10.2.0, before 10.2.4 (fixed in 10.2.4)
• Splunk Splunk Cloud Platform: from 9.3.2411, before 9.3.2411.132 (fixed in 9.3.2411.132); from 10.1.2507, before 10.1.2507.22 (fixed in 10.1.2507.22); from 10.2.2510, before 10.2.2510.14 (fixed in 10.2.2510.14); from 10.3.2512, before 10.3.2512.12 (fixed in 10.3.2512.12)
• Splunk Splunk Secure Gateway: from 3.8.0, before 3.8.67 (fixed in 3.8.67); from 3.9.0, before 3.9.20 (fixed in 3.9.20); from 3.10.0, before 3.10.6 (fixed in 3.10.6)

Published 2026-06-10. Last modified 2026-06-17.