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CVE-2023-41898

HighPublished

Arbitrary URL load in Android WebView in MyActivity.kt in Home Assistant Companion for Android

Published: Oct 19, 2023
Updated: Sep 12, 2024
Assigning CNA: GitHub_M
Evidence observed: Aug 11, 2026

Primary CVSS

8.6/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

EPSS probability estimate

0.2%

Low · next 30 days

Percentile: 6.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Home assistant is an open source home automation. The Home Assistant Companion for Android app up to version 2023.8.2 is vulnerable to arbitrary URL loading in a WebView. This enables all sorts of attacks, including arbitrary JavaScript execution, limited native code execution, and credential theft. This issue has been patched in version 2023.9.2 and all users are advised to upgrade. There are no known workarounds for this vulnerability. This issue is also tracked as GitHub Security Lab (GHSL) Vulnerability Report: `GHSL-2023-142`.

Sources

CVE-2023-41898_LabPoC
Walk through CVE-2023-41898: exploit an unvalidated deep link in Home Assistant Android to load arbitrary URLs in a privileged WebView and leak a fake token.

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