CVE-2026-20256: 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…

PriorityP433medium5.7CVSS 3.1

AVNACLPRLUIRSUCHINAN

EPSS

0.25%

16.4th percentile

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.

Affected

12 ranges

Vendor	Product	Version range	Fixed in
splunk	splunk	>= 10.0.0 < 10.0.7	10.0.7
splunk	splunk	>= 10.2.0 < 10.2.4	10.2.4
splunk	splunk	>= 9.3.0 < 9.3.13	9.3.13
splunk	splunk	>= 9.4.0 < 9.4.12	9.4.12
splunk	splunk_cloud_platform	>= 10.1.2507 < 10.1.2507.23	10.1.2507.23
splunk	splunk_cloud_platform	>= 10.2.2510 < 10.2.2510.15	10.2.2510.15
splunk	splunk_cloud_platform	>= 10.3.2512 < 10.3.2512.13	10.3.2512.13
splunk	splunk_cloud_platform	>= 9.3.2411 < 9.3.2411.132	9.3.2411.132
splunk	splunk_enterprise	>= 10.0 < 10.0.7	10.0.7
splunk	splunk_enterprise	>= 10.2 < 10.2.4	10.2.4
splunk	splunk_enterprise	>= 9.3 < 9.3.13	9.3.13
splunk	splunk_enterprise	>= 9.4 < 9.4.12	9.4.12

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.