CVE-2026-20253

In Splunk Enterprise 10.2 versions below 10.2.4 and 10 versions below 10.0.7, an unauthenticated user could create or truncate arbitrary files through a PostgreSQL sidecar service endpoint. The vulnerability exists because the PostgreSQL sidecar service endpoint lacks authentication controls, allowing any network-reachable user to invoke file operations without credentials. Splunk Enterprise versions 9.4 and earlier are not affected. If you cannot immediately upgrade to a fixed version, you can mitigate this vulnerability by disabling the PostgreSQL sidecar service.

Affected products

Splunk Cloud Platform, Splunk Enterprise

Splunk

< 10.0.7, 10.2.4

Fix

Available

CVSS 3.1

9.8 CRITICAL

EPSS

96.9% (100th percentile)

Weakness

CWE-306

NVD status

Analyzed

Published

2026-06-10