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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History

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'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-11T20:42:30.381Z

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

Link: CVE-2026-32112

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

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

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

Link: CVE-2026-32112

cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses