CVE-2026-44698
Home Assistant: Cross-origin iframe access token exfiltration via WebView JS bridge callback injection
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.
INFO
Published Date :
May 29, 2026, 2:16 p.m.
Last Modified :
July 21, 2026, 12:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-44698
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE |
Solution
- Update iOS app to 2026.4.1 or later.
- Update Android app to 2026.4.4 or later.
Public PoC/Exploit Available at Github
CVE-2026-44698 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-44698.
| URL | Resource |
|---|---|
| https://github.com/home-assistant/core/security/advisories/GHSA-7jp2-p2fw-mgvf |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-44698 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-44698
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-44698 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-44698 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Jul. 21, 2026
Action Type Old Value New Value Added Translation Title: Home Assistant, Description: Home Assistant es un software de automatización del hogar de código abierto que prioriza el control local y la privacidad. Antes de 2026.4.1 para iOS y 2026.4.4 para Android, las aplicaciones Home Assistant Companion para Android e iOS exponen un puente JavaScript a la WebView en la aplicación window.externalApp en Android y webkit.messageHandlers.getExternalAuth (junto con revokeExternalAuth y externalBus) en iOS. Dos fallos exponen el puente a todos los marcos (incluidos los iframes de origen cruzado) y la interpolación no saneada del identificador de devolución de llamada de JavaScript permite que un iframe de origen cruzado renderizado dentro de la aplicación Companion ejecute JavaScript arbitrario en el origen del marco principal del frontend de Home Assistant y exfiltre el token de acceso del usuario autenticado. Esta vulnerabilidad está corregida en 2026.4.1 para iOS y 2026.4.4 para Android. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'home-assistant', 'product': 'core', 'versions': [{'status': 'affected', 'version': '< 2026.4.4'}]}, {'vendor': 'Home Assistant', 'product': 'Companion app (iOS)', 'versions': [{'status': 'affected', 'version': '< 2026.4.1'}]}, {'vendor': 'Home Assistant', 'product': 'Companion app (Android)', 'versions': [{'status': 'affected', 'version': '< 2026.4.4'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-44698', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-05-29T13:58:46.407095Z'} -
New CVE Received by [email protected]
May. 29, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H Added CWE CWE-94 Added CWE CWE-749 Added CWE CWE-346 Added CWE CWE-940 Added Reference https://github.com/home-assistant/core/security/advisories/GHSA-7jp2-p2fw-mgvf