CVE-2026-20253 is a critical Splunk Enterprise flaw where the PostgreSQL sidecar’s unauthenticated backup/restore API can be reached through Splunk Web, letting an attacker abuse pg_dump/pg_restore to pull a malicious database from attacker infrastructure, restore attacker-controlled SQL locally, write files as the Splunk user, and eventually overwrite a scheduled Python script for remote code execution. This all highlights that Splunk Enterprise on AWS is especially exposed by default, affected versions below 10.2.4 / 10.0.7 should be patched immediately, and the impact is severe because compromising Splunk means compromising a system that often stores logs, auth events, firewall data, EDR telemetry, and other sensitive enterprise visibility data.