CVE-2025-20381

SPL commands allowlist controls bypass in Splunk MCP Server app through "run_splunk_query" MCP tool

State: Published
Severity: 5.4 Medium
Published: Dec 3, 2025
Updated: Dec 3, 2025
Reserved: Oct 10, 2024

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	5.4 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L	cisco

Weaknesses

CWE-863 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.

Affected Products

Product	Versions
Splunk MCP ServerSplunk	0.2 to before 0.2.4Affected

References

https://advisory.splunk.com/advisories/SVD-2025-1210

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