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.
The reliance on unauthenticated backup APIs for sidecar components fundamentally breaks the principle of least privilege, allowing lateral movement from a web-facing interface directly to the file system. This specific attack chain demonstrates how database utilities like pg_restore can be weaponized to escalate privileges and execute arbitrary code when integrated into a web application’s lifecycle without strict network segmentation or API authentication.
Ouch. That sucks. And it sounds like a petty dumb fuck up.
