CVE-2026-20239: Sensitive Information Disclosure through Log Files in Splunk Enterprise

Published May 20, 2026
·
Updated

In Splunk Enterprise versions below 10.2.2 and 10.0.5, and Splunk Cloud Platform versions below 10.3.2512.8, 10.2.2510.11, 10.1.2507.21, and 10.0.2503.13, a user with a role that has access to the internal index could view session cookies and response bodies that contain sensitive data.

Affected Software

8 affected components
Splunk Splunk Enterprise<10.2.2, <10.0.5
Splunk Splunk Cloud Platform<10.3.2512.8, <10.2.2510.11, <10.1.2507.21, <10.0.2503.13
Splunk splunk>=10.0.0<10.0.5
Splunk splunk>=10.2.0<10.2.2
Splunk Splunk Cloud Platform>=10.0.2503<10.0.2503.13
Splunk Splunk Cloud Platform>=10.1.2507<10.1.2507.21
Splunk Splunk Cloud Platform>=10.2.2510<10.2.2510.11
Splunk Splunk Cloud Platform>=10.3.2512<10.3.2512.8

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade Splunk Enterprise to a version that resolves this vulnerability.

    Fixed in 10.2.2
  2. Upgrade

    Upgrade Splunk Enterprise to a version that resolves this vulnerability.

    Fixed in 10.0.5
  3. Upgrade

    Upgrade Splunk Cloud Platform to a version that resolves this vulnerability.

    Fixed in 10.3.2512.8
  4. Upgrade

    Upgrade Splunk Cloud Platform to a version that resolves this vulnerability.

    Fixed in 10.2.2510.11
  5. Upgrade

    Upgrade Splunk Cloud Platform to a version that resolves this vulnerability.

    Fixed in 10.1.2507.21
  6. Upgrade

    Upgrade Splunk Cloud Platform to a version that resolves this vulnerability.

    Fixed in 10.0.2503.13

Event History

May 20, 2026
CVE Published
via MITRE·04:32 PM
Data Sourced
via MITRE·04:32 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·06:16 PM
DescriptionSeverityWeaknessAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2026-20239?

CVE-2026-20239 is classified as a high severity vulnerability due to the potential for sensitive information disclosure.

2

How do I fix CVE-2026-20239?

To fix CVE-2026-20239, upgrade your Splunk Enterprise or Splunk Cloud Platform to the latest versions that address the vulnerability.

3

Who is affected by CVE-2026-20239?

CVE-2026-20239 affects users of Splunk Enterprise versions below 10.2.2 and 10.0.5, and Splunk Cloud Platform versions below 10.3.2512.8, among others.

4

What type of information is disclosed in CVE-2026-20239?

CVE-2026-20239 can lead to the exposure of sensitive information contained within log files accessed through the _internal index.

5

What should I do if I can't upgrade due to CVE-2026-20239?

If you cannot upgrade, limit user roles and access to the _internal index to mitigate the risk associated with CVE-2026-20239.

Company

Resources

Contact

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