CVE-2026-20205: Information written to log files can be of a sensitive nature and give valuable guidance to an attacker or expose sensitive user information. in Splunk Splunk MCP Server
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.
AI Analysis
Technical Summary
In Splunk MCP Server app versions below 1.0.3, users with roles granting access to the _internal index or the mcp_tool_admin capability can view session and authorization tokens in clear text within log files. Access to these logs requires either local file access or administrative privileges to internal indexes, which by default are limited to admin roles. This vulnerability could lead to exposure of sensitive user information and potentially facilitate further attacks if exploited. No vendor advisory or patch information is currently available, so remediation status is unknown.
Potential Impact
The vulnerability allows disclosure of sensitive session and authorization tokens to users with elevated privileges or local access to log files. This exposure can compromise user sessions and authorization integrity, leading to potential unauthorized access or privilege escalation. The impact is rated high with confidentiality, integrity, and availability all affected according to the CVSS vector.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Meanwhile, review and restrict access to the Splunk _internal index and the mcp_tool_admin capability to administrator-level roles only. Follow Splunk's documentation on defining roles and capabilities to minimize exposure. Limit local access to log files to trusted administrators.
CVE-2026-20205: Information written to log files can be of a sensitive nature and give valuable guidance to an attacker or expose sensitive user information. in Splunk Splunk MCP Server
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
In Splunk MCP Server app versions below 1.0.3, users with roles granting access to the _internal index or the mcp_tool_admin capability can view session and authorization tokens in clear text within log files. Access to these logs requires either local file access or administrative privileges to internal indexes, which by default are limited to admin roles. This vulnerability could lead to exposure of sensitive user information and potentially facilitate further attacks if exploited. No vendor advisory or patch information is currently available, so remediation status is unknown.
Potential Impact
The vulnerability allows disclosure of sensitive session and authorization tokens to users with elevated privileges or local access to log files. This exposure can compromise user sessions and authorization integrity, leading to potential unauthorized access or privilege escalation. The impact is rated high with confidentiality, integrity, and availability all affected according to the CVSS vector.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Meanwhile, review and restrict access to the Splunk _internal index and the mcp_tool_admin capability to administrator-level roles only. Follow Splunk's documentation on defining roles and capabilities to minimize exposure. Limit local access to log files to trusted administrators.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- cisco
- Date Reserved
- 2025-10-08T11:59:15.397Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69dfaf6882d89c981f612b78
Added to database: 4/15/2026, 3:31:52 PM
Last enriched: 4/15/2026, 3:46:48 PM
Last updated: 4/16/2026, 6:23:05 AM
Views: 7
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