CVE-2025-20386

Local installation-file access via permissive directory ACLs

Published Dec 3, 2025 · Updated Feb 26, 2026

Incorrect permissions in affected Splunk Enterprise for Windows releases allow local users to access the installation directory and its contents. During installation or upgrade, the installer leaves inherited grants for Built-in Users and Authenticated Users on the directory tree instead of restricting access to administrative and service principals. A non-administrator account on the Windows host is the required gate, and the resulting access covers the installation directory and all of its contents.

CVSS severity8.0
High
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect permissions in affected Splunk Enterprise for Windows releases allow local users to access the installation directory and its contents. During installation or upgrade, the installer leaves inherited grants for Built-in Users and Authenticated Users on the directory tree instead of restricting access to administrative and service principals. A non-administrator account on the Windows host is the required gate, and the resulting access covers the installation directory and all of its contents.

The record

CVE
CVE-2025-20386
Published
Dec 3, 2025
Updated
Feb 26, 2026
Vendor
Splunk, Inc.
Product
Splunk Enterprise
Classifications
CWE-732, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0 <10.0.2
  2. Affected versionversion=9.2 <9.2.10
  3. Affected versionversion=9.3 <9.3.8
  4. Affected versionversion=9.4 <9.4.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Splunk, Inc. · Splunk Enterpriseversion=10.0 <10.0.2; version=9.2 <9.2.10; version=9.3 <9.3.8; version=9.4 <9.4.6

Published CVSS scores

8.0SplunkCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-732Incorrect Permission Assignment for Critical Resource
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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