Critical Splunk Enterprise Flaw Lets Attackers Run Code Without Authentication
Splunk Enterprise flaw CVE-2026-20253 allows unauthenticated RCE via PostgreSQL sidecar.
A critical vulnerability (CVE-2026-20253) in Splunk Enterprise allows unauthenticated attackers to execute arbitrary code remotely. The flaw, rated 9.8 CVSS, stems from a lack of authentication controls on a PostgreSQL sidecar service endpoint, enabling attackers to perform file operations and ultimately overwrite critical scripts for RCE. Splunk has released patches for affected versions.
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The lesson from this incident
Full lessonA critical vulnerability in Splunk Enterprise (CVE-2026-20253) demonstrates how missing authentication controls on service endpoints can lead to complete system compromise. The flaw allowed unauthenticated attackers to access a PostgreSQL sidecar service, perform unauthorized file operations, and ultimately achieve remote code execution with a devastating 9.8 CVSS score. This incident highlights the critical importance of implementing proper authentication controls on all service endpoints, even those that may seem internal or secondary to the main application. Organizations using affected Splunk versions faced immediate risk of complete system takeover until patches were applied.
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Indicators of Compromise
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- cve — CVE-2026-20253