Home Assistant Core vulnerabilities

Home Assistant Core before version 2026.6.0 contains a path traversal vulnerability that allows unauthenticated attackers to write arbitrary files to any directory on the host filesystem by uploading a crafted backup archive during the initial onboarding window. Attackers can manipulate the 'name' field inside the uploaded archive's backup.json to supply an absolute path, causing pathlib.Path.__truediv__ to discard the configured backup directory prefix and write attacker-controlled content to arbitrary locations, with full filesystem access when the process runs as root.

A path traversal vulnerability in the backup-restore function of Home Assistant Core before 2026.7.0 allows attackers to write files to arbitrary absolute filesystem paths by supplying a crafted tar archive with a SYMTYPE entry. Because the official Docker image runs the process as root, attackers can achieve remote code execution by overwriting auto-imported Python paths such as site-packages/sitecustomize.py.

Home Assistant Core before 2026.5.4 contains a cross-site scripting vulnerability in the Shelly integration's `async_get_media_image()` method. Attackers controlling a Shelly device's thumb field can serve arbitrary HTML content via a data URI with `text/html` content type without validation against an image-only allowlist. This enables theft of session tokens and authenticated calls to sensitive endpoints like locks, alarms, and covers.