---
id: CVE-2026-76286
title: >-
  In Splunk MCP Server versions below 1.2.1, Splunk MCP Server could send the
  Splunk platform authentication token of a user who runs a custom Application
  Programming Interface (API) tool to the URL configured for that tool
summary: >-
  In Splunk MCP Server versions below 1.2.1, Splunk MCP Server could send the
  Splunk platform authentication token of a user who runs a custom Application
  Programming Interface (API) tool to the URL configured for that tool. If
  another use…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:L/A:L'
cwe:
  - CWE-918
vendor: Splunk
product: Splunk MCP Server
affected:
  - mcp_server >= 1.2 < 1.2.1
published: '2026-10-07'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T21:17:20.387'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-76286'
references:
  - url: 'https://advisory.splunk.com/advisories/SVD-2026-1004'
    label: psirt@cisco.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-07T21:54:15.099Z'
---

## Overview

In Splunk MCP Server versions below 1.2.1, Splunk MCP Server could send the Splunk platform authentication token of a user who runs a custom Application Programming Interface (API) tool to the URL configured for that tool. If another user controls that URL, they could capture the token and use it to access data and perform actions as the user who ran the tool. Successful exploitation requires a user who holds a role that contains the mcp_tool_execute capability to run a custom API tool configured by another user. For more information see Configure the Splunk MCP Server (https://help.splunk.com/en/splunk-enterprise/mcp-server-for-splunk-platform/1.2/configure-the-splunk-mcp-server) and Managing custom tools in Splunk MCP Server (https://help.splunk.com/en/splunk-enterprise/mcp-server-for-splunk-platform/1.2/managing-custom-tools-in-splunk-mcp-server) in the Splunk documentation.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.