Input validation error in Splunk Enterprise - CVE-2026-20254
Published: June 12, 2026
Vulnerability identifier: #VU134460
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-20254
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Splunk Inc.
Affected software:
Splunk Enterprise
Splunk Enterprise
Detailed vulnerability description
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to improper input validation in Splunk Web classic dashboards when rendering a crafted dashboard containing inline CSS style attributes. A remote user can create a malicious dashboard to disclose sensitive information.
User interaction is required, and exploitation occurs when a higher-privileged user views the crafted dashboard. The issue bypasses the external content restriction and can trigger outbound requests to untrusted domains.
How to mitigate CVE-2026-20254
Install security update from vendor's website.