CVE-2026-20254: Splunk

Medium severity, CVSS 5.7. EPSS: 0.4% 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 10.3.2512.13, 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 craft a malicious classic dashboard that exfiltrates sensitive data to an external server when a higher-privileged user views it, bypassing the external content restriction through a Cascading Style Sheets (CSS) injection.<br><br>The Trusted Domains security check does not fully validate inline style attribute values, which can allow for outbound requests to untrusted domains and credential exfiltration when a victim views a crafted dashboard.

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 10.3.2512.13 (fixed in 10.3.2512.13)

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