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

Quick assessment

Affected
home-assistant Home Assistant Core
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Home Assistant是Home Assistant组织开源的一套开源的家庭自动化管理系统。该系统主要用于控制家庭自动化设备。 Home Assistant 2026.5.4之前版本存在跨站脚本漏洞，该漏洞源于Shelly集成的async_get_media_image()方法容易受到跨站脚本攻击，原因在于用户提供的data URI包含text/html内容类型且未通过仅图像白名单验证，从而导致攻击者通过控制Shelly设备的thumb字段提供任意HTML内容，可能导致会话令牌被盗和锁定、警报及覆盖

CVSS 4.7 · Medium EPSS 0.30% · P20

Affected Version Matrix 1

VendorProduct Version RangeStatus
home-assistant Home Assistant Core < 2026.5.4 affected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
Vulnerability Title
Home Assistant 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Home Assistant是Home Assistant组织开源的一套开源的家庭自动化管理系统。该系统主要用于控制家庭自动化设备。 Home Assistant 2026.5.4之前版本存在跨站脚本漏洞，该漏洞源于Shelly集成的async_get_media_image()方法容易受到跨站脚本攻击，原因在于用户提供的data URI包含text/html内容类型且未通过仅图像白名单验证，从而导致攻击者通过控制Shelly设备的thumb字段提供任意HTML内容，可能导致会话令牌被盗和锁定、警报及覆盖
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
home-assistant Home 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-2026-64825 9.3 CRITICAL Home Assistant Core < 2026.6.0 Path Traversal File Write via Backup Upload
CVE-2026-64824 8.4 HIGH Home 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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