What is CVE-2026-32112?

CVE-2026-32112 is a medium-severity vulnerability in Homeassistant-Ai Ha-Mcp, classified under Cross-site Scripting. CVSS score: 6.8/10. Published 2026-03-11.

How severe is CVE-2026-32112?

Medium severity. CVSS v3 base score is 6.8 out of 10.

XSS in Homeassistant-Ai Ha-Mcp

CVE-2026-32112

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (8.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N.

Affected products

Homeassistant-ai Ha-mcp — versions < 7.0.0
Homeassistant-ai Home_assistant_mcp_server

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-32112?: CVE-2026-32112 is a medium-severity vulnerability in Homeassistant-Ai Ha-Mcp, classified under Cross-site Scripting. CVSS score: 6.8/10. Published 2026-03-11.
How severe is CVE-2026-32112?: Medium severity. CVSS v3 base score is 6.8 out of 10.