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2 vulnerabilities found for Companion app (Android) by Home Assistant

CVE-2026-44698 (GCVE-0-2026-44698)

Vulnerability from nvd – Published: 2026-05-29 13:32 – Updated: 2026-05-29 13:58
VLAI
Title
Home Assistant: Cross-origin iframe access token exfiltration via WebView JS bridge callback injection
Summary
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.
Severity
8.3 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
CWE
  • CWE-94 - Improper Control of Generation of Code ('Code Injection')
  • CWE-346 - Origin Validation Error
  • CWE-749 - Exposed Dangerous Method or Function
  • CWE-940 - Improper Verification of Source of a Communication Channel
Assigner
References
Impacted products
Show details on NVD website
To clipboard 

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CVE-2026-44698 (GCVE-0-2026-44698)

Vulnerability from cvelistv5 – Published: 2026-05-29 13:32 – Updated: 2026-05-29 13:58
VLAI
Title
Home Assistant: Cross-origin iframe access token exfiltration via WebView JS bridge callback injection
Summary
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.
Severity
8.3 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
CWE
  • CWE-94 - Improper Control of Generation of Code ('Code Injection')
  • CWE-346 - Origin Validation Error
  • CWE-749 - Exposed Dangerous Method or Function
  • CWE-940 - Improper Verification of Source of a Communication Channel
Assigner
References
Impacted products
Show details on NVD website
To clipboard 

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