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CVE-2025-20381— SPL commands allowlist controls bypass in Splunk MCP Server app through "run_splunk_query" MCP tool

Quick assessment

Affected
Splunk Splunk MCP Server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Splunk MCP Server是美国Splunk公司的一个多云平台服务器。 Splunk MCP Server 0.2.4之前版本存在安全漏洞，该漏洞源于run_splunk_query工具可绕过SPL命令允许列表控制，可能导致未授权操作。

CVSS 5.4 · Medium EPSS 0.22% · P11
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I. Basic Information for CVE-2025-20381

Vulnerability Information
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Vulnerability Title
SPL commands allowlist controls bypass in Splunk MCP Server app through "run_splunk_query" MCP tool
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Splunk MCP Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Splunk MCP Server是美国Splunk公司的一个多云平台服务器。 Splunk MCP Server 0.2.4之前版本存在安全漏洞，该漏洞源于run_splunk_query工具可绕过SPL命令允许列表控制，可能导致未授权操作。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Splunk Splunk MCP Server 0.2 ~ 0.2.4 -

II. Public POCs for CVE-2025-20381

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III. Intelligence Information for CVE-2025-20381

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Vendor Advisories for CVE-2025-20381 (1)

Same Patch Batch · Splunk · 2025-12-03 · 9 CVEs total

CVE-2025-20387 8.0 HIGH Incorrect permissions assignment on Splunk Universal Forwarder for Windows during new inst
CVE-2025-20386 8.0 HIGH Incorrect permission assignment on Splunk Enterprise for Windows during new installation o
CVE-2025-20384 5.3 MEDIUM Unauthenticated Log Injection in Splunk Enterprise
CVE-2025-20389 4.3 MEDIUM Improper Input Validation in "label" column field in Splunk Secure Gateway App
CVE-2025-20383 4.3 MEDIUM Improper access control through push notifications for reports and alerts in Splunk Secure
CVE-2025-20382 3.5 LOW URL validation bypass through Views Dashboard in Splunk Enterprise
CVE-2025-20388 2.7 LOW Blind Server Side Request Forgery (SSRF) through Distributed Search Peers in Splunk Enterp
CVE-2025-20385 2.4 LOW Stored Cross-Site scripting (XSS) through Anchor Tag "href" in Navigation Bar Collections

IV. Related Vulnerabilities

Same product: Splunk MCP Server
Same vendor: Splunk
Same weakness: CWE-863

V. Comments for CVE-2025-20381

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