CVE-2026-20255: Improper Input Validation through Classic Dashboards in Splunk Enterprise

Published Jun 10, 2026
·
Updated

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.

Affected Software

10 affected components
Splunk Splunk Enterprise<10.2.4, <10.0.7, <9.4.12, <9.3.13
Splunk Splunk Cloud Platform<10.3.2512.13, <10.2.2510.15, <10.1.2507.23, <9.3.2411.132
Splunk splunk>=9.3.0<9.3.13
Splunk splunk>=9.4.0<9.4.12
Splunk splunk>=10.0.0<10.0.7
Splunk splunk>=10.2.0<10.2.4
Splunk Splunk Cloud Platform>=9.3.2411<9.3.2411.132
Splunk Splunk Cloud Platform>=10.1.2507<10.1.2507.23
Splunk Splunk Cloud Platform>=10.2.2510<10.2.2510.15
Splunk Splunk Cloud Platform>=10.3.2512<10.3.2512.13

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade Splunk Enterprise to a version that resolves this vulnerability.

    Fixed in 10.2.4
  2. Upgrade

    Upgrade Splunk Enterprise to a version that resolves this vulnerability.

    Fixed in 10.0.7
  3. Upgrade

    Upgrade Splunk Enterprise to a version that resolves this vulnerability.

    Fixed in 9.4.12
  4. Upgrade

    Upgrade Splunk Enterprise to a version that resolves this vulnerability.

    Fixed in 9.3.13
  5. Upgrade

    Upgrade Splunk Cloud Platform to a version that resolves this vulnerability.

    Fixed in 10.3.2512.13
  6. Upgrade

    Upgrade Splunk Cloud Platform to a version that resolves this vulnerability.

    Fixed in 10.2.2510.15
  7. Upgrade

    Upgrade Splunk Cloud Platform to a version that resolves this vulnerability.

    Fixed in 10.1.2507.23
  8. Upgrade

    Upgrade Splunk Cloud Platform to a version that resolves this vulnerability.

    Fixed in 9.3.2411.132

Event History

Jun 10, 2026
CVE Published
via MITRE·05:16 PM
Data Sourced
via MITRE·05:16 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·06:16 PM
DescriptionSeverityWeaknessAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2026-20255?

CVE-2026-20255 has a medium severity rating of 5.7.

2

How do I fix CVE-2026-20255?

To fix CVE-2026-20255, upgrade to Splunk Enterprise version 10.2.4 or higher or the appropriate versions of Splunk Cloud Platform.

3

Who is affected by CVE-2026-20255?

CVE-2026-20255 affects low-privileged users in Splunk Enterprise and Splunk Cloud Platform prior to specified versions.

4

What type of vulnerability is CVE-2026-20255?

CVE-2026-20255 is categorized as an improper input validation vulnerability.

5

What can an attacker do with CVE-2026-20255?

An attacker could craft a malicious classic dashboard that exploits this vulnerability to potentially exfiltrate sensitive information.

Company

Resources

Contact

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