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CVE-2026-20204

HIGHCVSS 7.1/10EPSS 3.28%

Last modified

CVE-2026-20204 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. 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 estimates a 3.28% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7.1/10

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

EPSS Probability
3.28%

86.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
SplunkSplunk>= 9.3.0, < 9.3.11
SplunkSplunk>= 9.4.0, < 9.4.10
SplunkSplunk>= 10.0.0, < 10.0.5
SplunkSplunk10.2.0
SplunkSplunk Cloud Platform>= 9.3.2411, < 9.3.2411.127
SplunkSplunk Cloud Platform>= 10.0.2503, < 10.0.2503.13
SplunkSplunk Cloud Platform>= 10.1.2507, < 10.1.2507.19
SplunkSplunk Cloud Platform>= 10.2.2510, < 10.2.2510.9
SplunkSplunk Cloud Platform>= 10.3.2512, < 10.3.2512.5

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is 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.
How severe is CVE-2026-20204?
CVE-2026-20204 has a CVSS score of 7.1/10 (HIGH severity). The EPSS model estimates a 3.28% probability of exploitation in the next 30 days.
How do I fix CVE-2026-20204?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-20204?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST