CVE-2026-32111 — ha-mcp OAuth 2.1 DCR mode enables network reconnaissance via an error oracle

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
homeassistant-ai / ha-mcp	affected < 7.0.0

CWE

CWE-918

References

https://github.com/homeassistant-ai/ha-mcp/security/advisories/GHSA-fmfg-9g7c-3vq7

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.