Insecure Temporary File in Splunk Enterprise - CVE-2026-20204
Published: April 17, 2026
Vulnerability identifier: #VU126413
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-20204
CWE-ID: CWE-377
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 arbitrary code.
The vulnerability exists due to improper handling and insufficient isolation of temporary files in the apptemp directory when uploading a malicious file to the $SPLUNK_HOME/var/run/splunk/apptemp directory. A remote user can upload a malicious file to execute arbitrary code.
The issue affects instances with Splunk Web enabled, and user interaction is required.
How to mitigate CVE-2026-20204
Install security update from vendor's website.