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CVE-2026-20205— Sensitive Information Disclosure in ''_internal'' index in Splunk MCP Server app

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 app 1.0.3之前版本存在安全漏洞，该漏洞源于明文存储会话和授权令牌，可能导致具有特定权限的用户查看明文令牌。

CVSS 7.2 · High EPSS 0.28% · P18

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-20205

Vulnerability Information
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Vulnerability Title
Sensitive Information Disclosure in ''_internal'' index in Splunk MCP Server app
Source: CVE Program / CVE List V5
Vulnerability Description
In Splunk MCP Server app versions below 1.0.3 , a user who holds a role with access to the Splunk `_internal` index or possesses the high-privilege capability `mcp_tool_admin` could view users session and authorization tokens in clear text.<br><br>The vulnerability would require either local access to the log files or administrative access to internal indexes, which by default only the admin role receives. <br><br>Review roles and capabilities on your instance and restrict internal index access to administrator-level roles. See [Define roles on the Splunk platform with capabilities](https://docs.splunk.com/Documentation/Splunk/latest/Security/Rolesandcapabilities) and [Connecting to MCP Server and Admin settings](https://help.splunk.com/en/splunk-enterprise/mcp-server-for-splunk-platform/connecting-to-mcp-server-and-admin-settings) in the Splunk documentation for more information.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
通过日志文件的信息暴露
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 app 1.0.3之前版本存在安全漏洞，该漏洞源于明文存储会话和授权令牌，可能导致具有特定权限的用户查看明文令牌。
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 1.0 ~ 1.0.3 -

II. Public POCs for CVE-2026-20205

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III. Intelligence Information for CVE-2026-20205

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Same Patch Batch · Splunk · 2026-04-15 · 4 CVEs total

CVE-2026-20204 7.1 HIGH Improper Handling and Insufficient Isolation of Specific Temporary Files in Splunk Enterpr
CVE-2026-20202 6.6 MEDIUM Improper Input Validation during User Account Creation in Splunk Enterprise
CVE-2026-20203 4.3 MEDIUM Improper Access Control in Data Model Acceleration in Splunk Enterprise

IV. Related Vulnerabilities

Same product: Splunk MCP Server
Same vendor: Splunk
Same weakness: CWE-532

V. Comments for CVE-2026-20205

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