# CVE-2026-76404: Remote Code Execution (RCE) through Deserialization of Untrusted Data in Splunk MCP Server app

> CVE-2026-76404: Remote Code Execution (RCE) through Deserialization of Untrusted Data in Splunk MCP Server app. CVSS 9.1 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-76404
Last updated: 2026-10-24T13:10:00Z

- Published: 2026-08-19 21:35 UTC · Updated: 2026-10-24 13:10 UTC · Assigner: cisco
- CVSS: 9.1 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
- EPSS: 0.75%, 55th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-502

## 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.

## Affected vendors and products

- Splunk: Splunk MCP Server app

## Tracked companies

- [Splunk](https://rewindex.com/company/splunk.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-76404)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-76404)
- [https://advisory.splunk.com/advisories/SVD-2026-0808](https://advisory.splunk.com/advisories/SVD-2026-0808)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-76404 · Markdown: https://rewindex.com/cve/CVE-2026-76404.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-76404 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:13:24.932Z