CVE-2026-20256
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Splunk | Splunk Enterprise | 10.2 < 10.2.4 | affected |
| Splunk | Splunk Enterprise | 10.0 < 10.0.7 | affected |
| Splunk | Splunk Enterprise | 9.4 < 9.4.12 | affected |
| Splunk | Splunk Enterprise | 9.3 < 9.3.13 | affected |
| Splunk | Splunk Cloud Platform | 10.3.2512 < 10.3.2512.13 | affected |
| Splunk | Splunk Cloud Platform | 10.2.2510 < 10.2.2510.15 | affected |
| Splunk | Splunk Cloud Platform | 10.1.2507 < 10.1.2507.23 | affected |
| Splunk | Splunk Cloud Platform | 9.3.2411 < 9.3.2411.132 | affected |
Weaknesses
- CWE-20: The product does not validate or incorrectly validates input that can affect the control flow or data flow of a program.
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
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