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4 vulnerabilities found for Splunk MCP Server by Splunk

CVE-2026-20205 (GCVE-0-2026-20205)

Vulnerability from nvd – Published: 2026-04-15 15:17 – Updated: 2026-04-15 17:39
VLAI?
Title
Sensitive Information Disclosure in ''_internal'' index in Splunk MCP Server app
Summary
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.
Severity ?
7.2 (High)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CWE
  • 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.
Assigner
References
Impacted products
Vendor Product Version
Splunk Splunk MCP Server Affected: 1.0 , < 1.0.3 (custom)
Create a notification for this product.
Date Public ?
2026-04-15 00:00
Credits
Charlie Huggard, Splunk
Show details on NVD website
To clipboard 

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CVE-2025-20381 (GCVE-0-2025-20381)

Vulnerability from nvd – Published: 2025-12-03 17:00 – Updated: 2025-12-03 21:29
VLAI?
Title
SPL commands allowlist controls bypass in Splunk MCP Server app through "run_splunk_query" MCP tool
Summary
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.
Severity ?
5.4 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
CWE
  • CWE-863 - The software performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.
Assigner
References
Impacted products
Vendor Product Version
Splunk Splunk MCP Server Affected: 0.2 , < 0.2.4 (custom)
Create a notification for this product.
Date Public ?
2025-12-03 00:00
Credits
Saket Pandey, Splunk
Show details on NVD website
To clipboard 

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CVE-2026-20205 (GCVE-0-2026-20205)

Vulnerability from cvelistv5 – Published: 2026-04-15 15:17 – Updated: 2026-04-15 17:39
VLAI?
Title
Sensitive Information Disclosure in ''_internal'' index in Splunk MCP Server app
Summary
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.
Severity ?
7.2 (High)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CWE
  • 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.
Assigner
References
Impacted products
Vendor Product Version
Splunk Splunk MCP Server Affected: 1.0 , < 1.0.3 (custom)
Create a notification for this product.
Date Public ?
2026-04-15 00:00
Credits
Charlie Huggard, Splunk
Show details on NVD website
To clipboard 

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CVE-2025-20381 (GCVE-0-2025-20381)

Vulnerability from cvelistv5 – Published: 2025-12-03 17:00 – Updated: 2025-12-03 21:29
VLAI?
Title
SPL commands allowlist controls bypass in Splunk MCP Server app through "run_splunk_query" MCP tool
Summary
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.
Severity ?
5.4 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
CWE
  • CWE-863 - The software performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.
Assigner
References
Impacted products
Vendor Product Version
Splunk Splunk MCP Server Affected: 0.2 , < 0.2.4 (custom)
Create a notification for this product.
Date Public ?
2025-12-03 00:00
Credits
Saket Pandey, Splunk
Show details on NVD website
To clipboard 

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