Input validation error in Splunk Enterprise - CVE-2026-20256
Published: June 12, 2026
Vulnerability identifier: #VU134458
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-2026-20256
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 classic dashboards when processing protocol-relative URLs in drill-down links. A remote user can create a crafted drill-down link to disclose sensitive information.
User interaction is required to follow the crafted link, and the external-navigation warning dialog is not shown.
How to mitigate CVE-2026-20256
Install security update from vendor's website.