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

CVSS 4.7 · Medium EPSS 0.18% · P8

Affected Version Matrix 1

VendorProductVersion RangeStatus
home-assistantHome Assistant Core< 2026.5.4affected
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I. Basic Information for CVE-2026-64823

Vulnerability Information
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Vulnerability Title
Home Assistant Core < 2026.5.4 XSS via Shelly media_player.py thumb URI
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
home-assistantHome Assistant Core 0 ~ 2026.5.4 -

II. Public POCs for CVE-2026-64823

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III. Intelligence Information for CVE-2026-64823

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Patches & Fixes for CVE-2026-64823 (2)

Vendor Advisories for CVE-2026-64823 (1)

Same Patch Batch · home-assistant · 2026-07-21 · 3 CVEs total

CVE-2026-648259.3 CRITICALHome Assistant Core < 2026.6.0 Path Traversal File Write via Backup Upload
CVE-2026-648248.4 HIGHHome Assistant Core < 2026.7.0 Symlink Path Traversal RCE via backup-restore

IV. Related Vulnerabilities

Same product: Home Assistant Core
Same vendor: home-assistant
Same weakness: CWE-79

V. Comments for CVE-2026-64823

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