CVE-2026-76404: Remote Code Execution (RCE) through Deserialization of Untrusted Data in Splunk MCP Server app
Critical · CVSS 9.1 (CVSS 3.1)EPSS 0.75%, 55th percentilePublished Updated Assigner: cisco
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.
Vector CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H · CWE-502
Tracked companies
Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
Splunk: Splunk MCP Server app
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- advisory.splunk.com/advisories/SVD-2026-0808 (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)