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CVE-2025-20381

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

MEDIUM
5.4
CVSS Score
Published: December 3, 2025 at 05:00 PM UTC
Updated: October 18, 2026 at 05:10 PM UTC
1 product affected across 1 vendorModel Context Protocol Server

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Model Context Protocol Server· Splunk
90%
0.2 ≤ v < 0.2.40.2
Affected range stops below 0.2.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.4MEDIUMcisco
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-863

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