Apps and add-ons
CVE-2026-76404: Remote Code Execution (RCE) through Deserialization of Untrusted Data in Splunk MCP Server app
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.
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Splunk MCP Server app 1.2 | 1.2.1 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
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.
Workarounds
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.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.