CVE-2026-76404

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

State: Published
Severity: 9.1 Critical
Published: Aug 19, 2026
Updated: Aug 20, 2026
Reserved: Aug 19, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	9.1 Critical	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H	cisco

Weaknesses

CWE-502 The application deserializes untrusted data without sufficiently verifying that the resulting data will be valid.

Affected Products

Product	Versions
Splunk MCP Server appSplunk	1.2 to before 1.2.1Affected

References

https://advisory.splunk.com/advisories/SVD-2026-0808

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