cvedb.io
CVE-2026-20256
MEDIUM · CVSS 5.7
EPSS exploitation probability: 0%
Published 2026-06-10T18:16:41.133 · Last modified 2026-06-17T10:17:20.563

Summary

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.

Affected products

splunk — splunk

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.