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Splunk Enterprise EUVD-2026-31139

| CVE-2026-20239 HIGH
Insertion of Sensitive Information into Log File (CWE-532)
2026-05-20 cisco GHSA-7mj7-jqh4-hc7f
7.5
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
May 20, 2026 - 18:30 vuln.today
Patch available
May 20, 2026 - 18:02 EUVD

DescriptionNVD

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.

AnalysisAI

Sensitive information disclosure in Splunk Enterprise (below 10.2.2 and 10.0.5) and Splunk Cloud Platform (multiple branches below 10.3.2512.8, 10.2.2510.11, 10.1.2507.21, and 10.0.2503.13) allows authenticated users with a role granting access to the _internal index to view session cookies and response bodies containing sensitive data logged by the platform. Cisco-reported and patched by Splunk in advisory SVD-2026-0503, the issue is a CWE-532 sensitive-data-in-logs flaw rather than a remote code execution bug, with no public exploit identified at time of analysis.

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RemediationAI

Within 24 hours: identify all Splunk Enterprise instances below 10.2.2 and 10.0.5, and Cloud instances below 10.3.2512.8/10.2.2510.11/10.1.2507.21/10.0.2503.13; assess which systems grant _internal index access to non-administrative users. Within 7 days: deploy vendor patches (Splunk Enterprise 10.2.2, 10.0.5 or later; Splunk Cloud per branch specifications in SVD-2026-0503) and restrict _internal index access to system administrators only. …

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EUVD-2026-31139 vulnerability details – vuln.today

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