CVE-2026-64823 Home Assistant Core < 2026.5.4 XSS via Shelly media_player.py thumb URI

Home Assistant Core before 2026.5.4 contains a cross-site scripting vulnerability in the Shelly integration's asyncgetmediaimage method that allows attackers controlling a Shelly device's thumb field to serve arbitrary HTML content by supplying a data URI with a text/html content type without...