CVE-2026-20204

Improper Handling and Insufficient Isolation of Specific Temporary Files in Splunk Enterprise

Published Apr 15, 2026 CVSS 3.1 · 7.1 High EPSS 3.2% KEV · Not listed

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

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Splunk

Splunk Enterprise

affected

Version	Status	Constraints
`10.2`	affected	< 10.2.1
`10.0`	affected	< 10.0.5
`9.4`	affected	< 9.4.10
`9.3`	affected	< 9.3.11

Splunk

Splunk Cloud Platform

affected

Version	Status	Constraints
`10.4.2603`	affected	< Not Affected
`10.3.2512`	affected	< 10.3.2512.5
`10.2.2510`	affected	< 10.2.2510.9
`10.1.2507`	affected	< 10.1.2507.19
`10.0.2503`	affected	< 10.0.2503.13
`9.3.2411`	affected	< 9.3.2411.127

Configuration 1 [-]

OR	cpe:2.3:a:splunk:splunk:::::enterprise:::*
	cpe:2.3:a:splunk:splunk:::::enterprise:::*
	cpe:2.3:a:splunk:splunk:::::enterprise:::*
	cpe:2.3:a:splunk:splunk:10.2.0::::enterprise:::

Configuration 2 [-]

OR	cpe:2.3:a:splunk:splunk_cloud_platform::::::::
	cpe:2.3:a:splunk:splunk_cloud_platform::::::::
	cpe:2.3:a:splunk:splunk_cloud_platform::::::::
	cpe:2.3:a:splunk:splunk_cloud_platform::::::::
	cpe:2.3:a:splunk:splunk_cloud_platform::::::::

No data.

Vendor Product Versions

Splunk

Splunk Cloud Platform

Version	Status	Scheme	Platform
`[10.4.2603,*]`	affected	semver	—
`[10.3.2512,10.3.2512.5)`	affected	generic	—
`[10.2.2510,10.2.2510.9)`	affected	generic	—
`[10.1.2507,10.1.2507.19)`	affected	generic	—
`[10.0.2503,10.0.2503.13)`	affected	generic	—
`[9.3.2411,9.3.2411.127)`	affected	generic	—

Splunk

Splunk Enterprise

Version	Status	Scheme	Platform
`[10.2,10.2.1)`	affected	semver	—
`[10.0,10.0.5)`	affected	semver	—
`[9.4,9.4.10)`	affected	semver	—
`[9.3,9.3.11)`	affected	semver	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: 3.2% (3.152% probability within 30 days)

Exploitation none

Automatable no

Technical Impact total

References

Link	Providers
https://advisory.splunk.com/advisories/SVD-2026-0403

History

Apr 17, 2026 7:15 PM First appearance in the feed. Affected versions updated. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Splunk splunk
CPEs		cpe:2.3:a:splunk:splunk:::::enterprise:::* cpe:2.3:a:splunk:splunk:10.2.0::::enterprise::: cpe:2.3:a:splunk:splunk_cloud_platform::::::::
Vendors & Products		Splunk splunk

Apr 15, 2026 7:00 PM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Splunk Splunk splunk Cloud Platform Splunk splunk Enterprise
Vendors & Products		Splunk Splunk splunk Cloud Platform Splunk splunk Enterprise

Apr 15, 2026 6:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Apr 15, 2026 3:30 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
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.
Title		Improper Handling and Insufficient Isolation of Specific Temporary Files in Splunk Enterprise
Weaknesses		CWE-377
References		https://advisory.splunk.com/advisories/SVD-2026-0403
Metrics		cvssV3_1 `{'score': 7.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H'}`