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
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.
References
security-advisories@github.comhttps://github.com/home-assistant/core/security/advisories/GHSA-7jp2-p2fw-mgvf
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "core",
          "vendor": "home-assistant",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2026.4.4"
            }
          ]
        },
        {
          "product": "Companion app (iOS)",
          "vendor": "Home Assistant",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2026.4.1"
            }
          ]
        },
        {
          "product": "Companion app (Android)",
          "vendor": "Home Assistant",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2026.4.4"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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\u0027s main-frame origin and exfiltrate the signed-in user\u0027s access token. This vulnerability is fixed in 2026.4.1 for iOS and 2026.4.4 for Android."
    },
    {
      "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",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.3,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.6,
        "impactScore": 6.0,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-44698",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-05-29T13:58:46.407095Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-05-29T14:16:28.823",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/home-assistant/core/security/advisories/GHSA-7jp2-p2fw-mgvf"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-94"
        },
        {
          "lang": "en",
          "value": "CWE-346"
        },
        {
          "lang": "en",
          "value": "CWE-749"
        },
        {
          "lang": "en",
          "value": "CWE-940"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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