CVE-2026-20255

Improper Input Validation through Classic Dashboards in Splunk Enterprise

State: Published
Severity: 5.7 Medium
Published: Jun 10, 2026
Updated: Jun 10, 2026
Reserved: Oct 8, 2025

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.

Scores

CVSS	Score	Vector	Source
3.1	5.7 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N	cisco

Weaknesses

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

Affected Products

Product	Versions
Splunk EnterpriseSplunk	10.2 to before 10.2.4Affected 10.0 to before 10.0.7Affected 9.4 to before 9.4.12Affected 9.3 to before 9.3.13Affected
Splunk Cloud PlatformSplunk	10.3.2512 to before 10.3.2512.13Affected 10.2.2510 to before 10.2.2510.15Affected 10.1.2507 to before 10.1.2507.23Affected 9.3.2411 to before 9.3.2411.132Affected

References

https://advisory.splunk.com/advisories/SVD-2026-0605

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