Critical [CVE-2026-76404] Remote Code Execution (RCE) through Deserialization of Untrusted Data in Splunk MCP Server app
This critical-severity Splunk advisory covers CVE-2026-76404 affecting Splunk MCP Server app.
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Summary
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.
- Splunk MCP Server app 1.2 before 1.2.1
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation
Upgrade to a fixed release: 1.2.1. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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