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archive/Patch now/AIR-2025-0506
closedclosed 3 Dec 2025Patch now2 Disclosed vulnerabilityAI

Splunk MCP Server Control Bypass Vulnerability CVE-2025-20381

Splunk MCP Server

Splunk MCP Server app allows users with access to specific tools to bypass SPL command allowlist controls via embedded sub-searches. This can lead to unauthorized actions exceeding the intended MCP restrictions.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

CVSS
5.4
EPSS
<0.01 · top 86% · 2026-11-13
EPSS scores by FIRST
fix status
Fix status unknown
first report
3 Dec 2025
last update
3 Dec 2025
CVE ids
CVE-2025-20381other records

Timeline · 1

  1. 3 Dec 2025CVE-2025-20381: In Splunk MCP Server app versions below 0.2.4, a user with access to the "run_splunk_query" Model Context Protocol (MCP) tool…

Sources · 1

Advisories and databases

  1. 2025-12-03
    CVE-2025-20381: In Splunk MCP Server app versions below 0.2.4, a user with access to the "run_splunk_query" Model Context Protocol (MCP) tool…
    NVD · nvd.nist.gov/vuln/detail/CVE-2025-20381

Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.

Classification

lane
Patch now
AI role
Attack on AI
categories
Infrastructure vulnerability
severity
2 · Disclosed vulnerability
fix status
Fix status unknown
targets
Framework / tooling
owasp llm top 10
LLM03:2025 Supply Chain
mitre atlas
no technique for these categories
tags
allowlist-bypass
dates
happened 3 Dec 2025 · first reported 3 Dec 2025
origin
NVD
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
record
confidence 0.95 · created 2026-10-18 10:04Z · updated 2026-10-18 10:04Z

Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned

Copy a brief

This record as a short Markdown brief, for a ticket, a chat or a coding agent.

the brief as text
# Splunk MCP Server Control Bypass Vulnerability CVE-2025-20381

https://gcdradar.vercel.app/incidents/splunk-mcp-server-control-bypass-vulnerability-cve-2025-2038 · AIR-2025-0506 · closed 2025-12-03

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2025-12-03
- AI role: Attack on AI
- Products: Splunk MCP Server
- CVE ids: CVE-2025-20381
- CVSS: 5.4

## Summary

Splunk MCP Server app allows users with access to specific tools to bypass SPL command allowlist controls via embedded sub-searches. This can lead to unauthorized actions exceeding the intended MCP restrictions.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2025-12-03: CVE-2025-20381: In Splunk MCP Server app versions below 0.2.4, a user with access to the "run_splunk_query" Model Context Protocol (MCP) tool… (https://nvd.nist.gov/vuln/detail/CVE-2025-20381)

## Sources

- 2025-12-03 NVD: CVE-2025-20381: In Splunk MCP Server app versions below 0.2.4, a user with access to the "run_splunk_query" Model Context Protocol (MCP) tool… https://nvd.nist.gov/vuln/detail/CVE-2025-20381

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.

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