Open redirect and data exfiltration in Splunk classic dashboards
CVE-2026-20256 affects classic dashboards in Splunk Enterprise before 10.2.4, 10.0.7, 9.4.12, and 9.3.13, and Splunk Cloud Platform before 10.3.2512.13, 10.2.2510.15, 10.1.2507.23, and 9.3.2411.132. A low-privileged user without the admin or power role can abuse drill-down links in classic dashboards by supplying a protocol-relative URL such as //attacker.com. The flaw exists because the dashboard URL classifier only treats explicit http:// and https:// schemes as external URLs. As a result, protocol-relative URLs bypass the external-URL check, and Splunk Web fails to present the external-navigation warning dialog before redirecting the victim. This improper input validation enables redirect-based data exfiltration when a victim accesses the crafted dashboard.
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