ha-mcp — Vulnerability (CVE-2026-32112)
Date: 2026-03
Affected: homeassistant-ai/home_assistant_mcp_server
Attack vector: xss
Category: vulnerability-disclosure
Severity: Medium
CVE: CVE-2026-32112
CWE: CWE-79
CVSS: 6.8 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N)

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.


Mitigations:

Architectural layers (MAESTRO):