CVE-2026-44698— Home Assistant: Cross-origin iframe access token exfiltration via WebView JS bridge callback injection
Possible ATT&CK Techniques 1AI
T1530 · Data from Cloud StorageAffected Version Matrix 3
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: NVD (National Vulnerability Database)
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
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-44698 (1)
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V. Comments for CVE-2026-44698
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