CVE-2026-20205CWE-532

Sensitive Information Disclosure in ''_internal'' index in Splunk MCP Server app

High · published April 15, 2026

CVSS v3.1
7.2
EPSS
0%
Percentile
19.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.2 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00278 · 19.1th percentile
Weakness
CWE-532 · Insertion of Sensitive Information into Log File
Published
2026-04-15T15:17Z
EPSS history
Timeline
  • 15 APR 15:17Z
    Sensitive Information Disclosure in ''_internal'' index in Splunk MCP Server app
    cvelistv5