CVE-2026-20256
EUVD-2026-3608010.06.2026, 18:16
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 cause data exfiltration through classic dashboards by redirecting a victim to an external site using a protocol-relative URL in a drill-down link.<br><br>The vulnerability exists because the URL classifier in classic dashboards only recognizes `http://` and `https://` schemes when checking for external URLs. Protocol-relative URLs such as `//attacker.com` bypass this check entirely, and Splunk Web does not show the external-navigation warning dialog to the victim.Enginsight
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
| Vendor | Product | Version | Source |
|---|---|---|---|
| splunk | splunk | 10.2 ≤ 𝑥 < 10.2.4 | CNA |
| splunk | splunk | 10.0 ≤ 𝑥 < 10.0.7 | CNA |
| splunk | splunk | 9.4 ≤ 𝑥 < 9.4.12 | CNA |
| splunk | splunk | 9.3 ≤ 𝑥 < 9.3.13 | CNA |
| splunk | splunk | 10.3.2512 ≤ 𝑥 < 10.3.2512.13 | CNA |
| splunk | splunk | 10.2.2510 ≤ 𝑥 < 10.2.2510.15 | CNA |
| splunk | splunk | 10.1.2507 ≤ 𝑥 < 10.1.2507.23 | CNA |
| splunk | splunk | 9.3.2411 ≤ 𝑥 < 9.3.2411.132 | CNA |
Common Weakness Enumeration