Incorrect authorization in Splunk MCP Server - CVE-2025-20381
Published: December 4, 2025
Vulnerability identifier: #VU119141
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2025-20381
CWE-ID: CWE-863
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Splunk Inc.
Affected software:
Splunk MCP Server
Splunk MCP Server
Detailed vulnerability description
The vulnerability allows a remote user to bypass implemented security restrictions.
The vulnerability exists due to incorrect authorization checks. A remote user with access to the “run_splunk_query” Model Context Protocol (MCP) tool can bypass the SPL command allowlist controls in MCP by embedding SPL commands as sub-searches and perform unauthorized actions beyond the intended MCP restrictions.
How to mitigate CVE-2025-20381
Install updates from vendor's website.