Sunday, 13 September 2026
8 agent hacks today 7 vs yesterday (1)

ha-mcp Home Assistant MCP server: SSRF and XSS flaws in beta OAuth consent form

Versions of the ha-mcp Home Assistant MCP server prior to 7.0.0 contained two vulnerabilities in the beta OAuth consent flow: an unvalidated user-supplied ha_url enabling unauthenticated server-side request forgery for internal network reconnaissance (CVE-2026-32111), and unescaped user-controlled parameters rendered via Python f-strings enabling JavaScript execution in the operator's browser (CVE-2026-32112). Both were fixed in release 7.0.0.

Disclosed 11 March 2026 · Record updated 13 September 2026

Impact

Unauthenticated attackers could probe internal networks through an error oracle, and a crafted authorization URL could run JavaScript in the server operator's browser. Only deployments using the beta OAuth mode (ha-mcp-oauth) are affected; the standard private-URL deployment with a pre-configured token is not.

Our coverage

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-32111
  2. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-32112