CVE-2023-41898: Arbitrary URL load in Android WebView in `MyActivity.kt` in Home Assistant Companion for Android

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-10-19 · updated 2026-06-17
Weakness: CWE-94

Description

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`.

Affected products

home-assistant Home Assistant Companion: before 2023.9.2 — fixed in 2023.9.2

How to fix

Upgrade to a fixed version: home-assistant Home Assistant Companion 2023.9.2. Check the vendor advisory for mitigations.

References

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