CVE-2026-64823
Home Assistant Core before 2026.5.4 contains a cross-site scripting vulnerability in the Shelly integration's async_get_media_image() 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 validation against an image-only allowlist. Attackers can cause the media player proxy endpoint to serve attacker-controlled bytes with Content-Type text/html in the Home Assistant web origin, enabling theft of session tokens from local storage and authenticated calls to sensitive service endpoints including lock, alarm, and cover controls.
- Affected products
- Home Assistant Core
- Fix
- Available
- CVSS 3.1
- 4.7 MEDIUM
- EPSS
- 0.2% (8th percentile)
- Weakness
- CWE-79
- NVD status
- Deferred
- Published
- 2026-07-21
No indexed exploits for CVE-2026-64823 yet
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