CVE-2026-20256
June 10, 2026, 6:36 p.m.
5.7
Medium
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.
Product(s) Impacted
| Vendor | Product | Versions |
|---|---|---|
| Splunk |
|
|
Weaknesses
Common security weaknesses mapped to this vulnerability.
CWE-20
Improper Input Validation
The product receives input or data, but it does
not validate or incorrectly validates that the input has the
properties that are required to process the data safely and
correctly.
*CPE(s)
Affected systems and software identified for this CVE.
| Type | Vendor | Product | Version | Update | Edition | Language | Software Edition | Target Software | Target Hardware | Other Information |
|---|---|---|---|---|---|---|---|---|---|---|
| a | splunk | splunk_enterprise | <10.2.4 | / | / | / | / | / | / | / |
| a | splunk | splunk_enterprise | <10.0.7 | / | / | / | / | / | / | / |
| a | splunk | splunk_enterprise | <9.4.12 | / | / | / | / | / | / | / |
| a | splunk | splunk_enterprise | <9.3.13 | / | / | / | / | / | / | / |
| a | splunk | splunk_cloud_platform | <10.3.2512.13 | / | / | / | / | / | / | / |
| a | splunk | splunk_cloud_platform | <10.2.2510.15 | / | / | / | / | / | / | / |
| a | splunk | splunk_cloud_platform | <10.1.2507.23 | / | / | / | / | / | / | / |
| a | splunk | splunk_cloud_platform | <9.3.2411.132 | / | / | / | / | / | / | / |
Tags
CVSS Score
CVSS Data - 3.1
- Attack Vector: NETWORK
- Attack Complexity: LOW
- Privileges Required: LOW
- Scope: UNCHANGED
- Confidentiality Impact: HIGH
- Integrity Impact: NONE
- Availability Impact: NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
Timeline
Published: June 10, 2026, 6:16 p.m.
Last Modified: June 10, 2026, 6:36 p.m.
Last Modified: June 10, 2026, 6:36 p.m.
Status : Undergoing Analysis
CVE has been recently published to the CVE List and has been received by the NVD.
More infoSource
*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.