CVE-2026-20205

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

Affected Software

Weaknesses

• 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.

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

References

• https://advisory.splunk.com/advisories/SVD-2026-0407

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