What is CVE-2026-66061?

CVE-2026-66061 is a high-severity vulnerability in Home-Assistant Core, classified under Missing Authorization. CVSS score: 7.1/10. Published 2026-08-07.

How severe is CVE-2026-66061?

High severity. CVSS v3 base score is 7.1 out of 10.

Auth bypass in Home-Assistant Core

CVE-2026-66061

Home Assistant is open source home automation software focused on local control and privacy. Prior to 2026.5.0, the iOS Companion app treats tag links (NFC or QR) delivered through an OS-level routing mechanism such as iOS universal links as if they were physically scanned, without validating the calling app or prompting the user. As a result, any untrusted app on the device can forward an arbitrary tag to Home Assistant, causing it to execute the associated automation as though a legitimate user had scanned an authorized tag. This allows silent, unattended automation execution by untrusted local callers. This issue has been fixed in version 2026.5.0.

Vulnerability class: Broken Access Control

EPSS: 0.002 (5.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N.

Affected products

Home-assistant Core — versions < 2026.5.0

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-66061?: CVE-2026-66061 is a high-severity vulnerability in Home-Assistant Core, classified under Missing Authorization. CVSS score: 7.1/10. Published 2026-08-07.
How severe is CVE-2026-66061?: High severity. CVSS v3 base score is 7.1 out of 10.