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CVE-2026-44698— Home Assistant: Cross-origin iframe access token exfiltration via WebView JS bridge callback injection

Quick assessment

Affected
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 2026.4.1之前版本（iOS）和2026.4.4之前版本（Android）存在安全漏洞，该漏洞源于JavaScript桥暴露给所有帧（包括跨源iframe）以及JavaScript回调标识符未清理插值，可能导致跨源iframe在Companion应用内执行任意JavaScript并窃取已登录用户的访问令牌。

CVSS 8.3 · High EPSS 0.17% · P5

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 3

VendorProduct Version RangeStatus
Home Assistant Companion app (Android) < 2026.4.4 affected
Home Assistant Companion app (iOS) < 2026.4.1 affected
home-assistant core < 2026.4.4 affected
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I. Basic Information for CVE-2026-44698

Vulnerability Information
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Vulnerability Title
Home Assistant: Cross-origin iframe access token exfiltration via WebView JS bridge callback injection
Source: CVE Program / CVE List V5
Vulnerability Description
Home Assistant is open source home automation software that puts local control and privacy first. Prior to 2026.4.1 for iOS and 2026.4.4 for Android, he Home Assistant Companion apps for Android and iOS expose a JavaScript bridge to the in-app WebView window.externalApp on Android and webkit.messageHandlers.getExternalAuth (alongside revokeExternalAuth and externalBus) on iOS. Two flaws expose the bridge to all frames (including cross-origin iframes) and unsanitized interpolation of the JavaScript callback identifier allows a cross-origin iframe rendered inside the Companion app to execute arbitrary JavaScript in the Home Assistant frontend's main-frame origin and exfiltrate the signed-in user's access token. This vulnerability is fixed in 2026.4.1 for iOS and 2026.4.4 for Android.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Home Assistant 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Home Assistant是Home Assistant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 2026.4.1之前版本（iOS）和2026.4.4之前版本（Android）存在安全漏洞，该漏洞源于JavaScript桥暴露给所有帧（包括跨源iframe）以及JavaScript回调标识符未清理插值，可能导致跨源iframe在Companion应用内执行任意JavaScript并窃取已登录用户的访问令牌。
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 core < 2026.4.4 -
Home Assistant Companion app (iOS) < 2026.4.1 -
Home Assistant Companion app (Android) < 2026.4.4 -

II. Public POCs for CVE-2026-44698

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III. Intelligence Information for CVE-2026-44698

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Vendor Advisories for CVE-2026-44698 (1)

IV. Related Vulnerabilities

Same product: core
Same vendor: home-assistant
Same weakness: CWE-94

V. Comments for CVE-2026-44698

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