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Sensitive Information in LogsWeakness · CWE-532

CVE-2026-20205

HIGH · 7.2 CVSS v3.1 Published 2026-04-15
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
78/100
Remediation priority · High
Remotely reachable Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

Splunk MCP Server versions below 1.0.3 expose session and authorization tokens in clear text within log files accessible through the `_internal` index. Users with the `mcp_tool_admin` capability or roles permitting access to the `_internal` index can read these sensitive tokens.

MitigationRestrict access to the `_internal` index to only administrator-level roles and review/remove the `mcp_tool_admin` capability from non-admin users to prevent token exposure.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify Splunk MCP Server installation and version
    Locate the Splunk MCP Server app or add-on in your Splunk deployment and retrieve its version number. Compare this version against the affected range (versions below 1.0.3).
    Affected if The installed version of Splunk MCP Server is below 1.0.3.
  2. Verify access to the _internal index
    Review role configurations and search permissions to determine which users or roles have access to the _internal index. Check if any non-administrator roles permit searching this index.
    Affected if Non-admin users or roles have permission to search the _internal index.
  3. Identify users with mcp_tool_admin capability
    Inspect user roles and capabilities within Splunk to determine which users possess the mcp_tool_admin capability. Review role definitions to see if this capability is assigned to non-administrator roles.
    Affected if Any user without administrator privileges holds the mcp_tool_admin capability.
  4. Search _internal logs for exposed tokens
    Run a search against the _internal index using keywords such as 'session', 'token', 'authorization', or 'bearer' to locate any clear-text credentials in log entries. Review the results for exposed authentication tokens.
    Affected if Clear-text session or authorization tokens appear in logs within the _internal index.

Your environment is affected if Splunk MCP Server version is below 1.0.3 AND (non-admin users can access the _internal index OR users hold the mcp_tool_admin capability), resulting in token exposure in logs.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Restrict access to the `_internal` index to only administrator-level roles and review/remove the `mcp_tool_admin` capability from non-admin users to prevent token exposure.

Recommended fix High confidence

Splunk MCP Server version 1.0.3

  1. Identify the current version of the Splunk MCP Server app installed on your instance
  2. Upgrade the Splunk MCP Server app to version 1.0.3 or later
  3. Review user roles and capabilities to ensure only administrator-level roles have access to the _internal index
  4. If needed, restrict the _internal index access to admin roles only by modifying role configurations
  5. Verify that session and authorization tokens are no longer being logged in clear text after the upgrade

Generated from the published advisory — verify against the referenced sources before acting.

Have this fixed Scoped from the published advisory
  • Consultation3.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
8.0 hours of engineering $1,440
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-20205 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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