SB2025120436 - Incorrect authorization in Splunk MCP Server
Published: December 4, 2025
Security Bulletin ID
SB2025120436
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Incorrect authorization (CVE-ID: CVE-2025-20381)
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.
Remediation
Install update from vendor's website.