High

Analysis Summary

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.

Impact

• Gain Access

Indicators of Compromise

CVE

• CVE-2026-20253

Affected Vendors

Remediation

Refer to Cisco Splunk Security Advisory for patch, upgrade, or suggested workaround information.

Cisco Splunk Security Advisory