PT-2026-48496 · Splunk · Splunk Cloud Platform+1

Tony Tong · Published 2026-06-10 · Updated 2026-06-10 · CVE-2026-20256

NVD

CVSS v3.1

5.7

Medium

Base vector

AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

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.

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.

Fix

RCE

Weakness Enumeration

CWE-20

Related Identifiers

CVE-2026-20256

Affected Products

Splunk Cloud Platform

Splunk Enterprise

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-20256 · Security Note
• https://advisory.splunk.com/advisories/SVD-2026-0606 · Note