CVE-2026-76404

Remote Code Execution (RCE) through Deserialization of Untrusted Data in Splunk MCP Server app

Published Aug 19, 2026 CVSS 3.1 · 9.1 Critical EPSS < 1% KEV · Not listed
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.

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

No advisories available
History
Type Values Removed Values Added
First Time appeared Splunk model Context Protocol Server
CPEs cpe:2.3:a:splunk:model_context_protocol_server:*:*:*:*:*:*:*:*
Vendors & Products Splunk model Context Protocol Server
Type Values Removed Values Added
Metrics ssvc

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

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

Weaknesses

Sources

Status
PUBLISHED
Assigner
cisco
Published
Updated
Aug 20, 2026, 3:26 PM
Reserved
Aug 19, 2026, 12:02 PM
Status
Analyzed
Published
Aug 19, 2026, 10:17 PM
Modified
Oct 24, 2026, 1:10 PM