CVE-2026-76404: Splunk Model Context Protocol Server

Critical severity, CVSS 9.1. EPSS: 0.7% chance of exploitation in the next 30 days.

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 products

• Splunk Model Context Protocol Server: before 1.2.1 (fixed in 1.2.1)

Published 2026-08-19. Last modified 2026-08-24.