Cyber Intelligence
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Cybersecurity

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Cybersecurity10 min readJun 14, 2026

CVE-2026-20253: Splunk Enterprise Unauthenticated RCE Explained

CVE-2026-20253 is a critical 9.8 CVSS flaw in Splunk Enterprise that lets an unauthenticated attacker create or truncate arbitrary files through an exposed PostgreSQL sidecar service, a chain that researchers extended into full pre-auth remote code execution. Here is how the flaw works, which versions are affected, and exactly what to patch first.

SplunkCVE-2026-20253Vulnerability Management