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

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 mcptooladmin 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 and Connecting to MCP Server and Admin settings in the Splunk documentation for more information.