CVE-2026-20256
Description
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.
CVSS Details
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N Threat Intelligence
Weaknesses 1
Affected Products 8
| Vendor | Product | Version | Range |
|---|---|---|---|
| splunk | splunk | * | ≥9.3.0 – <9.3.13 |
| splunk | splunk | * | ≥9.4.0 – <9.4.12 |
| splunk | splunk | * | ≥10.0.0 – <10.0.7 |
| splunk | splunk | * | ≥10.2.0 – <10.2.4 |
| splunk | splunk_cloud_platform | * | ≥9.3.2411 – <9.3.2411.132 |
| splunk | splunk_cloud_platform | * | ≥10.1.2507 – <10.1.2507.23 |
| splunk | splunk_cloud_platform | * | ≥10.2.2510 – <10.2.2510.15 |
| splunk | splunk_cloud_platform | * | ≥10.3.2512 – <10.3.2512.13 |
References 1
- advisory.splunk.com https://advisory.splunk.com/advisories/SVD-2026-0606
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.