Splunk MCP Server App up to 1.0.2 mcp_tool_admin log file

Summaryinfo

A vulnerability categorized as problematic has been discovered in Splunk MCP Server App up to 1.0.2. Impacted is the function mcp_tool_admin. Executing a manipulation can lead to log file. This vulnerability is handled as CVE-2026-20205. The attack can be executed remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Splunk MCP Server App up to 1.0.2 and classified as problematic. This vulnerability affects the function mcp_tool_admin. The manipulation with an unknown input leads to a log file vulnerability. The CWE definition for the vulnerability is CWE-532. Information written to log files can be of a sensitive nature and give valuable guidance to an attacker or expose sensitive user information. As an impact it is known to affect confidentiality. CVE summarizes:

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.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. 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.

The advisory is shared for download at advisory.splunk.com. This vulnerability was named CVE-2026-20205 since 10/08/2025. The exploitation appears to be easy. The attack can be initiated remotely. The exploitation needs additional levels of successful authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1592.

Upgrading to version 1.0.3 eliminates this vulnerability.

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Productinfo

Type

• Log Management Software

Vendor

• Splunk

Name

• MCP Server App

Version

• 1.0.0
• 1.0.1
• 1.0.2

License

• free

CPE 2.3info

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CPE 2.2info

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