CVE-2026-32111

ha-mcp OAuth 2.1 DCR mode enables network reconnaissance via an error oracle

Published Mar 11, 2026 CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

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
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
Type Values Removed Values Added
Metrics ssvc

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

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

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Mar 12, 2026, 2:03 PM
Reserved
Mar 10, 2026, 10:02 PM
Status
Analyzed
Published
Mar 11, 2026, 9:16 PM
Modified
Jun 17, 2026, 10:35 AM