CVE-2026-20252: Splunk

High severity, CVSS 7.6. EPSS: 0.3% 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 10.4.2604.3, 10.3.2512.12, 10.2.2510.14, 10.1.2507.22, and 9.3.2411.132, a low-privileged user that does not hold the "admin" or "power" Splunk roles could send server-side requests to arbitrary internal destinations through the Dashboard Studio PDF export feature. The vulnerability exists because the trusted-domain validation uses a prefix match that can be bypassed with attacker-controlled subdomains (for example, docs.splunk.com.evil.com), and because the PDF export service follows HTTP redirects automatically without re-validating each redirect target against the allowlist.

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); from 10.4.2604, before 10.4.2604.3 (fixed in 10.4.2604.3)

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