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3 vulnerabilities found for Splunk MCP Server by Splunk
CVE-2026-76286 (GCVE-0-2026-76286)
Vulnerability from cvelistv5
Published
2026-10-07 20:46
Modified
2026-10-08 18:00
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-918 - The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.
Summary
In Splunk MCP Server versions below 1.2.1, Splunk MCP Server could send the Splunk platform authentication token of a user who runs a custom Application Programming Interface (API) tool to the URL configured for that tool. If another user controls that URL, they could capture the token and use it to access data and perform actions as the user who ran the tool. Successful exploitation requires a user who holds a role that contains the mcp_tool_execute capability to run a custom API tool configured by another user. For more information see Configure the Splunk MCP Server (https://help.splunk.com/en/splunk-enterprise/mcp-server-for-splunk-platform/1.2/configure-the-splunk-mcp-server) and Managing custom tools in Splunk MCP Server (https://help.splunk.com/en/splunk-enterprise/mcp-server-for-splunk-platform/1.2/managing-custom-tools-in-splunk-mcp-server) in the Splunk documentation.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Splunk | Splunk MCP Server |
Version: 1.2 < 1.2.1 |
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CVE-2026-20205 (GCVE-0-2026-20205)
Vulnerability from cvelistv5
Published
2026-04-15 15:17
Modified
2026-04-15 17:39
Severity ?
VLAI Severity ?
EPSS score ?
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.
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Splunk | Splunk MCP Server |
Version: 1.0 < 1.0.3 |
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CVE-2025-20381 (GCVE-0-2025-20381)
Vulnerability from cvelistv5
Published
2025-12-03 17:00
Modified
2025-12-03 21:29
Severity ?
VLAI Severity ?
EPSS score ?
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.
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Splunk | Splunk MCP Server |
Version: 0.2 < 0.2.4 |
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