Vulnerability in Splunk
CVE-2026-20204
In Splunk Enterprise versions below 10.2.1, 10.0.5, 9.4.10, and 9.3.11, and Splunk Cloud Platform versions below 10.4.2603.0, 10.3.2512.5, 10.2.2510.9, 10.1.2507.19, 10.0.2503.13, and 9.3.2411.127, a low-privileged user that does not hold the `admin` or `power` Splunk roles could potentially perform a Remote Code Execution (RCE) by uploading a malicious file to the `$SPLUNK_HOME/var/run/splunk/apptemp` directory due to improper handling and insufficient isolation of temporary files within the `apptemp` directory.
EPSS: 0.033 (87.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Splunk — versions 10.2.0
- Splunk Cloud Platform — versions 10.4.2603, 10.3.2512, 10.2.2510
- Splunk Splunk_cloud_platform
- Splunk Enterprise — versions 10.2, 10.0, 9.4
Weakness classification (CWE)
References
- psirt@cisco.com (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-20204?
- CVE-2026-20204 is a high-severity vulnerability in Splunk, classified under Insecure Temporary File. CVSS score: 7.1/10. Published 2026-04-15.
- How severe is CVE-2026-20204?
- High severity. CVSS v3 base score is 7.1 out of 10.