CVE-2026-76404
Remote Code Execution (RCE) through Deserialization of Untrusted Data in Splunk MCP Server app
Severity
Critical 9.1
CVSS 3.1
Exploited
Not listed
EPSS
0.006
44.3th percentile
Discovered by
Not disclosed
Published
Aug 19, 2026
Assigned by 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.
Weakness: CWE-502
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Splunk Apps & Add-ons | SIEM & Log Management | cna-assigner |
Vendor-reported products (1)
- Splunk · Splunk MCP Server app
Credit
Kuniyoshi Noguchi (KuniNogu)
Vendor remediation
Upgrade each affected Splunk app or add-on to the applicable fixed version listed in Product Status.