CVE-2026-20258: Splunk

Medium severity, CVSS 5.4. EPSS: 0.2% 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, and Splunk Cloud Platform versions below 10.3.2512.11, 10.2.2510.15, 10.1.2507.23, and 9.3.2411.132, a low-privileged user that does not hold the "admin" or "power" Splunk roles could store a malicious script in a classic dashboard HTML panel, causing unauthorized JavaScript code to execute in the browser of another user. The vulnerability requires the attacker to phish the victim by tricking them into initiating a request within their browser. The low-privileged user should not be able to exploit the vulnerability at will.

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 10.1.2507.23 (fixed in 10.1.2507.23); from 10.2.2510, before 10.2.2510.15 (fixed in 10.2.2510.15); from 10.3.2512, before 10.3.2512.11 (fixed in 10.3.2512.11)

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