Inclusion of Sensitive Information in Log Files in Splunk Enterprise - CVE-2026-20239

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Main Vulnerability Database Vulnerabilities #VU132090

Inclusion of Sensitive Information in Log Files in Splunk Enterprise - CVE-2026-20239

Published: May 21, 2026


Vulnerability identifier: #VU132090
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-20239
CWE-ID: CWE-532
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Splunk Inc.
Affected software:
Splunk Enterprise

Detailed vulnerability description

The vulnerability allows a remote user to disclose sensitive information.

The vulnerability exists due to missing output buffer sanitization in the TcpChannel component when discarding data during socket errors. A remote user can access the _internal index to disclose sensitive information.

Exposed data may include session cookies and response bodies containing sensitive information.


How to mitigate CVE-2026-20239

Install security update from vendor's website.

Sources