What is CVE-2025-20381?

CVE-2025-20381 is a medium-severity vulnerability in Splunk Mcp Server, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2025-12-03.

How severe is CVE-2025-20381?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Auth bypass in Splunk Mcp Server

CVE-2025-20381

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 unau…

Vulnerability class: Broken Access Control

EPSS: 0.001 (16.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.

Affected products

Splunk Mcp Server — versions 0.2

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

advisory.splunk.com/advisories/SVD-2025-1210

Frequently asked questions

What is CVE-2025-20381?: CVE-2025-20381 is a medium-severity vulnerability in Splunk Mcp Server, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2025-12-03.
How severe is CVE-2025-20381?: Medium severity. CVSS v3 base score is 5.4 out of 10.