Description
In Splunk MCP Server app versions below 1.2.1, a user who holds the "admin" Splunk role could execute arbitrary commands on the underlying operating system. The vulnerability is possible because of missing input validation in the app's credential management component, which deserializes stored data without checking whether the content is of the expected type.
Published: 2026-08-19
Score: 9.1 Critical
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Solution

Upgrade each affected Splunk app or add-on to the applicable fixed version listed in Product Status.


Vendor Workaround

Turn off or remove the Splunk MCP Server app. For more information see [Manage app and add-on objects](https://help.splunk.com/en/splunk-enterprise/administer/admin-manual/10.2/meet-splunk-apps/manage-app-and-add-on-objects) in the Splunk documentation.

Tracking

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Advisories

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History

Fri, 21 Aug 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 20 Aug 2026 09:30:00 +0000

Type Values Removed Values Added
First Time appeared Splunk
Splunk splunk Mcp Server App
Vendors & Products Splunk
Splunk splunk Mcp Server App

Wed, 19 Aug 2026 21:45:00 +0000

Type Values Removed Values Added
Description In Splunk MCP Server app versions below 1.2.1, a user who holds the "admin" Splunk role could execute arbitrary commands on the underlying operating system. The vulnerability is possible because of missing input validation in the app's credential management component, which deserializes stored data without checking whether the content is of the expected type.
Title Remote Code Execution (RCE) through Deserialization of Untrusted Data in Splunk MCP Server app
Weaknesses CWE-502
References
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H'}


Subscriptions

Splunk Splunk Mcp Server App
cve-icon MITRE

Status: PUBLISHED

Assigner: cisco

Published:

Updated: 2026-08-20T15:26:31.137Z

Reserved: 2026-08-19T12:02:03.632Z

Link: CVE-2026-76404

cve-icon Vulnrichment

Updated: 2026-08-20T15:23:55.839Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-08-19T22:17:27.170

Modified: 2026-08-20T16:18:16.417

Link: CVE-2026-76404

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-20T11:00:04Z

Weaknesses