Splunk MCP Server App v<0.2.4 Allows Unchecked SPL via MCP Sub-searches
CVE-2025-20381 Published on December 3, 2025
SPL commands allowlist controls bypass in Splunk MCP Server app through "run_splunk_query" MCP tool
In Splunk MCP Server app versions below 0.2.4, a user with access to the "run_splunk_query" Model Context Protocol (MCP) tool could bypass the SPL command allowlist controls in MCP by embedding SPL commands as sub-searches, leading to unauthorized actions beyond the intended MCP restrictions.
Weakness Type
What is an AuthZ Vulnerability?
The software performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.
CVE-2025-20381 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2025-20381
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Affected Versions
Splunk MCP Server:- Version 0.2 and below 0.2.4 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.