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CVE-2026-20256

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

MEDIUM
5.7
CVSS Score
Published: June 10, 2026 at 05:15 PM UTC
Updated: June 17, 2026 at 10:17 AM UTC
2 products affected across 1 vendorSplunkSplunk Cloud Platform

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Severity
MEDIUM5.7
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Splunk· Splunk
95%
10.0 ≤ v < 10.0.710.0.0 ≤ v < 10.0.710.2 ≤ v < 10.2.410.2.0 ≤ v < 10.2.49.3 ≤ v < 9.3.139.3.0 ≤ v < 9.3.139.4 ≤ v < 9.4.129.4.0 ≤ v < 9.4.1210.010.29.39.4
Affected range stops below 10.0.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.2.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.3.13, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.4.12, so it looks safe — our inference, not a vendor statement
Splunk Cloud Platform· Splunk
95%
10.1.2507 ≤ v < 10.1.2507.2310.2.2510 ≤ v < 10.2.2510.1510.3.2512 ≤ v < 10.3.2512.139.3.2411 ≤ v < 9.3.2411.13210.1.250710.2.251010.3.25129.3.2411
Affected range stops below 10.1.2507.23, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.2.2510.15, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.3.2512.13, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.3.2411.132, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://advisory.splunk.com/advisories/SVD-2026-0606

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.7MEDIUMcisco
Vector?

Quick Info

StatusANALYZED
CWE
CWE-20

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