What’s Vulnerable › Vulnerabilities
CVE-2026-32111: ha-mcp OAuth 2.1 DCR mode enables network reconnaissance via an error oracle
- Severity: medium (CVSS 5.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-03-11 · updated 2026-06-17
- Weakness: CWE-918
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.
Affected products
- homeassistant-ai ha-mcp: before 7.0.0 — fixed in 7.0.0
How to fix
Upgrade to a fixed version: homeassistant-ai ha-mcp 7.0.0. Check the vendor advisory for mitigations.
References
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