What’s Vulnerable › Vulnerabilities

CVE-2026-20258: Stored Cross-Site Scripting (XSS) through Classic Dashboard in Splunk Enterprise

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% 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-79

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 10.3.2512.11, 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 store a malicious script in a classic dashboard HTML panel, causing unauthorized JavaScript code to execute in the browser of another user. The vulnerability requires the attacker to phish the victim by tricking them into initiating a request within their browser. The low-privileged user should not be able to exploit the vulnerability at will.

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 10.3.2512.11 — fixed in 10.1.2507.23, 10.2.2510.15, 10.3.2512.11, 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, 10.3.2512.11, 9.3.2411.132. Check the vendor advisory for mitigations.

References

• https://advisory.splunk.com/advisories/SVD-2026-0608

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