A missing authorization vulnerability in Home Assistant core allows unauthenticated attackers to execute unauthorized commands, posing a risk to system integrity.

This vulnerability involves a missing authorization check (CWE-862) within the Home Assistant core framework. It allows an unauthenticated attacker to interact with internal functions without providing valid credentials.

The ability to bypass authorization can lead to unauthorized modification of automation configurations, potentially creating safety risks or allowing for the exfiltration of sensitive device data. The CVSS score of 7.1 reflects the high severity of allowing unauthorized control over critical infrastructure management software.

Immediate Action: Update the Home Assistant core installation to version 2026.5.3 or later.

Proactive Monitoring: Monitor system logs for unexpected API calls or unauthorized attempts to access administrative endpoints.

Compensating Controls: Implement network-level restrictions, such as firewall rules, to prevent external access to the Home Assistant interface.

Public Exploit Available: Unknown

Security teams and administrators must apply the update to version 2026.5.3 as soon as possible. Maintaining a patched environment is the only reliable way to ensure that authorization controls function as intended and prevent unauthorized system manipulation.