Vulnerability · Published Dec 3, 2025 · Assigned by cisco
CVE-2025-20381SPL commands allowlist controls bypass in Splunk MCP Server app through "run_splunk_query" MCP tool
Medium 5.4
In plain English
A medium-severity incorrect authorization in Splunk MCP Server from Splunk. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).
Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)0.2%top 85.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
In Splunk MCP Server app versions below 0.2.4, a user with access to the "run_splunk_query" Model Context Protocol (MCP) tool could bypass the SPL command allowlist controls in MCP by embedding SPL commands as sub-searches, leading to unauthorized actions beyond the intended MCP restrictions.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Splunk | Splunk MCP Server | 0.2 – before 0.2.4 |
Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L