What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-10 · updated 2026-06-17
• Weakness: CWE-20

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.

Affected products

• Splunk Enterprise: from 9.3.0 before 9.3.13; from 9.4.0 before 9.4.12; from 10.0.0 before 10.0.7; from 10.2.0 before 10.2.4 — fixed in 10.0.7, 10.2.4, 9.3.13, 9.4.12
• Splunk Cloud Platform: from 9.3.2411 before 9.3.2411.132; from 10.1.2507 before 10.1.2507.23; from 10.2.2510 before 10.2.2510.15; from 10.3.2512 before 10.3.2512.13 — fixed in 10.1.2507.23, 10.2.2510.15, 10.3.2512.13, 9.3.2411.132

How to fix

Upgrade to a fixed version: Splunk Enterprise 10.0.7, 10.2.4, 9.3.13, 9.4.12; Splunk Cloud Platform 10.1.2507.23, 10.2.2510.15, 10.3.2512.13, 9.3.2411.132. Check the vendor advisory for mitigations.

References

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

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