Improper Input Validation through Protocol-Relative URL in Classic Dashboards in Splunk Enterprise

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Summary

CVECVE-2026-20256
StatePUBLISHED
Assignercisco
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-10 18:16:41 UTC
Updated2026-06-10 18:16:41 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.7 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

EPSS: 0.000450000 probability, percentile 0.144440000 (date 2026-06-14)

Problem Types: CWE-20 | CWE-20 The product does not validate or incorrectly validates input that can affect the control flow or data flow of a program.

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.7MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
3.1CNACVSS5.7MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Splunk Splunk Enterprise affected 10.2 10.2.4 custom Not specified
CNA Splunk Splunk Enterprise affected 10.0 10.0.7 custom Not specified
CNA Splunk Splunk Enterprise affected 9.4 9.4.12 custom Not specified
CNA Splunk Splunk Enterprise affected 9.3 9.3.13 custom Not specified
CNA Splunk Splunk Cloud Platform affected 10.3.2512 10.3.2512.13 custom Not specified
CNA Splunk Splunk Cloud Platform affected 10.2.2510 10.2.2510.15 custom Not specified
CNA Splunk Splunk Cloud Platform affected 10.1.2507 10.1.2507.23 custom Not specified
CNA Splunk Splunk Cloud Platform affected 9.3.2411 9.3.2411.132 custom Not specified

References

ReferenceSourceLinkTags
advisory.splunk.com/advisories/SVD-2026-0606 [email protected] advisory.splunk.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Tony Tong (tongster) (en)

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