What’s Vulnerable › Vulnerabilities
CVE-2026-20204: Improper Handling and Insufficient Isolation of Specific Temporary Files in Splunk Enterprise
- Severity: high (CVSS 7.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 3.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-04-15 · updated 2026-10-26
- Weakness: CWE-377
Description
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.
Affected products
- Splunk Enterprise: from 9.3.0 before 9.3.11; from 9.4.0 before 9.4.10; from 10.0.0 before 10.0.5; 10.2.0 — fixed in 9.3.11, 9.4.10, 10.0.5
- Splunk Cloud Platform: from 9.3.2411 before 9.3.2411.127; from 10.0.2503 before 10.0.2503.13; from 10.1.2507 before 10.1.2507.19; from 10.2.2510 before 10.2.2510.9; from 10.3.2512 before 10.3.2512.5 — fixed in 9.3.2411.127, 10.0.2503.13, 10.1.2507.19, 10.2.2510.9, 10.3.2512.5
How to fix
Upgrade to a fixed version: Splunk Enterprise 9.3.11, 9.4.10, 10.0.5; Splunk Cloud Platform 9.3.2411.127, 10.0.2503.13, 10.1.2507.19, 10.2.2510.9. Check the vendor advisory for mitigations.
References
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