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Vulnerabilities

CVE-2026-44698 | BDVDB-2026-336574 Detail

home-assistantcore

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.

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact high. Attack vector: network.

Weaknesses#

  • 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

References#

Exploit#

No public exploit known

History#

  1. Version 1Record published in the CVE List.