CVE-2026-44698Network attack vector

Access token theft via WebView callback injection

Published May 29, 2026 · Updated May 29, 2026

Code injection in Home Assistant Companion for Android before 2026.4.4 and iOS before 2026.4.1 allows remote attackers to steal access tokens. The native bridges expose authentication handlers to cross-origin frames, then interpolate an unvalidated callback into JavaScript evaluated in the trusted main-frame origin. Exploitation requires a signed-in user to open a dashboard containing an attacker-controlled Webpage iframe; the stolen bearer token grants that user's REST API access, and the bridge can also revoke the session and force re-onboarding.

CVSS severity8.3
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Home Assistant Companion for Android before 2026.4.4 and iOS before 2026.4.1 allows remote attackers to steal access tokens. The native bridges expose authentication handlers to cross-origin frames, then interpolate an unvalidated callback into JavaScript evaluated in the trusted main-frame origin. Exploitation requires a signed-in user to open a dashboard containing an attacker-controlled Webpage iframe; the stolen bearer token grants that user's REST API access, and the bridge can also revoke the session and force re-onboarding.

The record

CVE
CVE-2026-44698
Published
May 29, 2026
Updated
May 29, 2026
Vendor
Home Assistant
Product
Home Assistant for Android
Classifications
CWE-346, CWE-94, CWE-940, CWE-749, T1528
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 29, 2026CVE publishedPublication date reported by the CVE source.
  2. May 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2026.4.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Home Assistant · Home Assistant for Androidversion=< 2026.4.4
Home Assistant · Home Assistant for iOSversion=< 2026.4.1
Home Assistant · Home Assistant Coreversion=< 2026.4.4

Published CVSS scores

8.3GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-346Origin Validation Error
CWE-94Improper Control of Generation of Code ('Code Injection')
CWE-940Improper Verification of Source of a Communication Channel
CWE-749Exposed Dangerous Method or Function
T1528Steal Application Access Token

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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