CVE-2026-20255 Details
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 craft a malicious classic dashboard that exfiltrates sensitive data to an external server. The vulnerability exists because URL validation on the external content dialog is incomplete, which can allow for requests to untrusted domains when a user interacts with a crafted dashboard.
A vulnerability exists in Splunk Enterprise versions prior to 10.2.4, 10.0.7, 9.4.12, and 9.3.13, as well as in Splunk Cloud Platform versions prior to 10.3.2512.13, 10.2.2510.15, 10.1.2507.23, and 9.3.2411.132. The issue allows low-privileged users, who do not have 'admin' or 'power' roles, to create malicious classic dashboards that can exfiltrate sensitive data to external servers. This vulnerability arises from incomplete URL validation in the external content dialog, which can permit requests to untrusted domains when a user interacts with a crafted dashboard.
Users can upgrade to Splunk Enterprise versions 10.4.0, 10.2.4, 10.0.7, 9.4.12, and 9.3.13. For Splunk Cloud Platform, instances are actively monitored and patched. Additionally, users can configure the Dashboards Trusted Domains List to restrict which external domains can be accessed by dashboards, and review which roles have permission to create and edit classic dashboards.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jun 10, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://advisory.splunk.com/advisories/SVD-2026-0605 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-20 | Improper Input Validation | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| splunk splunk | >= 9.3.0, < 9.3.13 >= 9.4.0, < 9.4.12 >= 10.0.0, < 10.0.7 >= 10.2.0, < 10.2.4 |
CPE
Remediation
| |
| splunk splunk cloud platform | >= 9.3.2411, < 9.3.2411.132 >= 10.1.2507, < 10.1.2507.23 >= 10.2.2510, < 10.2.2510.15 >= 10.3.2512, < 10.3.2512.13 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 15, 2026 | Initial Analysis | [email protected] |
| Jun 10, 2026 | New CVE Received | [email protected] |