CVE-2026-20239: Splunk

Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days.

In Splunk Enterprise versions below 10.2.2 and 10.0.5, and Splunk Cloud Platform versions below 10.3.2512.8, 10.2.2510.11, 10.1.2507.21, and 10.0.2503.13, a user with a role that has access to the `_internal` index could view session cookies and response bodies that contain sensitive data.

Affected products

• Splunk Splunk: 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 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 10.3.2512.8 (fixed in 10.3.2512.8)

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