ha-mcp is a Home Assistant MCP Server. Prior to 7.0.0, the ha-mcp OAuth consent form renders user-controlled parameters via Python f-strings with no HTML escaping. An attacker who can reach the OAuth endpoint and convince the server operator to follow a crafted authorization URL could execute JavaScript in the operator's browser. This affects only users running the beta OAuth mode (ha-mcp-oauth), which is not part of the standard setup and requires explicit configuration. This vulnerability is fixed in 7.0.0.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-pf93-j98v-25pv ha-mcp has XSS via Unescaped HTML in OAuth Consent Form
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

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

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, '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 renders user-controlled parameters via Python f-strings with no HTML escaping. An attacker who can reach the OAuth endpoint and convince the server operator to follow a crafted authorization URL could execute JavaScript in the operator's browser. This affects only users running the beta OAuth mode (ha-mcp-oauth), which is not part of the standard setup and requires explicit configuration. This vulnerability is fixed in 7.0.0.
Title ha-mcp has XSS via Unescaped HTML in OAuth Consent Form
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 6.8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-12T14:05:47.508Z

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

Link: CVE-2026-32112

cve-icon Vulnrichment

Updated: 2026-03-12T14:05:32.007Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-03-11T21:16:17.450

Modified: 2026-03-12T21:08:22.643

Link: CVE-2026-32112

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-03-12T09:55:58Z

Weaknesses