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Critical Splunk Enterprise Flaw Enables Unauthenticated Remote Code Execution

Cyber Press
Cyber Press
Published June 13, 2026Original Report

Excerpt

A critical vulnerability in Splunk Enterprise elevates what was initially reported as an arbitrary file-creation flaw to unauthenticated Remote Code Execution (RCE). Tracked as CVE-2026-20253, the vulnerability carries a maximum CVSS score of 9.8. It specifically impacts the PostgreSQL Sidecar Service introduced in Splunk version 10. According to Watchtowr, the sidecar service is not installed or enabled by default on on-premises Windows deployments; Splunk Enterprise…

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Attack Flow7 steps · MITRE ATT&CK mapped

Initial AccessTA0001T1190
1/7
Exploit Public-Facing Application
ActionExploit public-facing application
Attackers exploit a vulnerability in Splunk Enterprise's PostgreSQL Sidecar Service API, accessible via the main web application proxy.

Indicators of Compromise

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1 indicators

TypeIndicatorConfidenceScoreFirst Seen
CVECVE-2026-20253HighScore 67/100First seen

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