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Vulnerability Details :

CVE-2026-44698

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-29 May, 2026 | 13:32
Updated At-29 May, 2026 | 13:58
Rejected At-
Credits

Home Assistant: Cross-origin iframe access token exfiltration via WebView JS bridge callback injection

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
â–¼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:29 May, 2026 | 13:32
Updated At:29 May, 2026 | 13:58
Rejected At:
â–¼CVE Numbering Authority (CNA)
Home Assistant: Cross-origin iframe access token exfiltration via WebView JS bridge callback injection

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.

Affected Products
Vendor
home-assistant
Product
core
Versions
Affected
  • < 2026.4.4
Vendor
Home Assistant
Product
Companion app (iOS)
Versions
Affected
  • < 2026.4.1
Vendor
Home Assistant
Product
Companion app (Android)
Versions
Affected
  • < 2026.4.4
Problem Types
TypeCWE IDDescription
CWECWE-94CWE-94: Improper Control of Generation of Code ('Code Injection')
CWECWE-346CWE-346: Origin Validation Error
CWECWE-749CWE-749: Exposed Dangerous Method or Function
CWECWE-940CWE-940: Improper Verification of Source of a Communication Channel
Type: CWE
CWE ID: CWE-94
Description: CWE-94: Improper Control of Generation of Code ('Code Injection')
Type: CWE
CWE ID: CWE-346
Description: CWE-346: Origin Validation Error
Type: CWE
CWE ID: CWE-749
Description: CWE-749: Exposed Dangerous Method or Function
Type: CWE
CWE ID: CWE-940
Description: CWE-940: Improper Verification of Source of a Communication Channel
Metrics
VersionBase scoreBase severityVector
3.18.3HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
Version: 3.1
Base score: 8.3
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/home-assistant/core/security/advisories/GHSA-7jp2-p2fw-mgvf
x_refsource_CONFIRM
Hyperlink: https://github.com/home-assistant/core/security/advisories/GHSA-7jp2-p2fw-mgvf
Resource:
x_refsource_CONFIRM
â–¼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Information is not available yet
â–¼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:29 May, 2026 | 14:16
Updated At:29 May, 2026 | 14:16

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.18.3HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
Type: Secondary
Version: 3.1
Base score: 8.3
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
CPE Matches

Weaknesses
CWE IDTypeSource
CWE-94Primarysecurity-advisories@github.com
CWE-346Primarysecurity-advisories@github.com
CWE-749Primarysecurity-advisories@github.com
CWE-940Primarysecurity-advisories@github.com
CWE ID: CWE-94
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-346
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-749
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-940
Type: Primary
Source: security-advisories@github.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/home-assistant/core/security/advisories/GHSA-7jp2-p2fw-mgvfsecurity-advisories@github.com
N/A
Hyperlink: https://github.com/home-assistant/core/security/advisories/GHSA-7jp2-p2fw-mgvf
Source: security-advisories@github.com
Resource: N/A

Change History

0
Information is not available yet

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Matching Score-4
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||
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Action-Not Available
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CWE ID-CWE-94
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Details not found