Description
ha-mcp is a Home Assistant MCP Server. Prior to 7.0.0, the ha-mcp OAuth consent form (beta feature) accepts a user-supplied ha_url and makes a server-side HTTP request to {ha_url}/api/config with no URL validation. An unauthenticated attacker can submit arbitrary URLs to perform internal network reconnaissance via an error oracle. Two additional code paths in OAuth tool calls (REST and WebSocket) are affected by the same primitive. The primary deployment method (private URL with pre-configured HOMEASSISTANT_TOKEN) is not affected. This vulnerability is fixed in 7.0.0.
Published: 2026-03-11
Score: 5.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Information Disclosure
Action: Upgrade
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-fmfg-9g7c-3vq7 ha-mcp OAuth 2.1 DCR mode enables network reconnaissance via an error oracle
History

Tue, 17 Mar 2026 15:45:00 +0000

Type Values Removed Values Added
First Time appeared Homeassistant-ai home Assistant Mcp Server
CPEs cpe:2.3:a:homeassistant-ai:home_assistant_mcp_server:*:*:*:*:*:*:*:*
Vendors & Products Homeassistant-ai home Assistant Mcp Server

Thu, 12 Mar 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 12 Mar 2026 10:15:00 +0000

Type Values Removed Values Added
First Time appeared Homeassistant-ai
Homeassistant-ai ha-mcp
Vendors & Products Homeassistant-ai
Homeassistant-ai ha-mcp

Wed, 11 Mar 2026 21:00:00 +0000

Type Values Removed Values Added
Description ha-mcp is a Home Assistant MCP Server. Prior to 7.0.0, the ha-mcp OAuth consent form (beta feature) accepts a user-supplied ha_url and makes a server-side HTTP request to {ha_url}/api/config with no URL validation. An unauthenticated attacker can submit arbitrary URLs to perform internal network reconnaissance via an error oracle. Two additional code paths in OAuth tool calls (REST and WebSocket) are affected by the same primitive. The primary deployment method (private URL with pre-configured HOMEASSISTANT_TOKEN) is not affected. This vulnerability is fixed in 7.0.0.
Title ha-mcp OAuth 2.1 DCR mode enables network reconnaissance via an error oracle
Weaknesses CWE-918
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}


Subscriptions

Homeassistant-ai Ha-mcp Home Assistant Mcp Server
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-12T14:03:53.910Z

Reserved: 2026-03-10T22:02:38.855Z

Link: CVE-2026-32111

cve-icon Vulnrichment

Updated: 2026-03-12T14:03:49.217Z

cve-icon NVD

Status : Analyzed

Published: 2026-03-11T21:16:17.267

Modified: 2026-03-17T15:37:53.473

Link: CVE-2026-32111

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-03-20T15:37:06Z

Weaknesses