CVE-2026-20253

Known Exploited Vulnerability

Splunk Enterprise Missing Authentication for Critical Function Vulnerability

Vendor / product: Splunk / Enterprise

Description

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.

Weakness classification

• CWE-306: Missing Authentication for Critical Function

Primary references

• psirt@cisco.com — Mitigation, Vendor Advisory
• 134c704f-9b21-4f2e-91b3-4a467353bcc0 — Exploit, Third Party Advisory
• 134c704f-9b21-4f2e-91b3-4a467353bcc0 — US Government Resource