Vulnerability-Lookup

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

Vulnerability from cvelistv5 – Published: 2026-05-29 13:32 – Updated: 2026-05-29 13:58

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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

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

GitHub_M

References

1 reference

URL	Tags
https://github.com/home-assistant/core/security/a…	x_refsource_CONFIRM

Impacted products

3 products

Vendor	Product	Version
home-assistant	core	Affected: < 2026.4.4
Home Assistant	Companion app (iOS)	Affected: < 2026.4.1
Home Assistant	Companion app (Android)	Affected: < 2026.4.4

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-44698

Vulnerability from fkie_nvd - Published: 2026-05-29 14:16 - Updated: 2026-07-21 12:10

Severity

8.3 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/home-assistant/core/security/advisories/GHSA-7jp2-p2fw-mgvf

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "core",
          "vendor": "home-assistant",
          "versions": [
            {
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            }
          ]
        },
        {
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          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2026.4.1"
            }
          ]
        },
        {
          "product": "Companion app (Android)",
          "vendor": "Home Assistant",
          "versions": [
            {
              "status": "affected",
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            }
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    }
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    },
    {
      "lang": "es",
      "value": "Home Assistant es un software de automatizaci\u00f3n del hogar de c\u00f3digo 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 aplicaci\u00f3n 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 interpolaci\u00f3n no saneada del identificador de devoluci\u00f3n de llamada de JavaScript permite que un iframe de origen cruzado renderizado dentro de la aplicaci\u00f3n 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 est\u00e1 corregida en 2026.4.1 para iOS y 2026.4.4 para Android."
    }
  ],
  "id": "CVE-2026-44698",
  "lastModified": "2026-07-21T12:10:00.090",
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

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

FKIE_CVE-2026-44698

Tags

Sightings

Nomenclature