Cross-site scripting in Splunk Enterprise - CVE-2026-20258
Published: June 12, 2026
Vulnerability identifier: #VU134456
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-20258
CWE-ID: CWE-79
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 execute unauthorized JavaScript code in another user's browser.
The vulnerability exists due to cross-site scripting in the classic dashboard HTML panel when processing stored dashboard content. A remote user can store a malicious script and trick the victim into initiating a request within their browser to execute unauthorized JavaScript code in another user's browser.
User interaction is required, and exploitation requires the dashboard_html_allow_embeddable_content setting to be enabled.
How to mitigate CVE-2026-20258
Install security update from vendor's website.