CVE-2023-41898Public exploit

Credential theft via unsanitized WebView path injection

Published Oct 19, 2023 · Updated Sep 12, 2024

Code injection in Home Assistant Companion for Android before 2023.9.2 allows local users to steal credentials through a crafted Intent. The exported MyActivity loads an Intent-supplied URL into a JavaScript-enabled WebView, then passes an unsanitized entityId into evaluateJavascript. Exploitation requires a malicious or compromised app on the same Android device and can expose the user's external-auth access token when that feature is enabled.

CVSS severity8.6
High
EPSS probability0.16%
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 2023.9.2 allows local users to steal credentials through a crafted Intent. The exported MyActivity loads an Intent-supplied URL into a JavaScript-enabled WebView, then passes an unsanitized entityId into evaluateJavascript. Exploitation requires a malicious or compromised app on the same Android device and can expose the user's external-auth access token when that feature is enabled.

The record

CVE
CVE-2023-41898
Published
Oct 19, 2023
Updated
Sep 12, 2024
Vendor
Home Assistant
Product
Home Assistant Core
Classifications
CWE-345, CWE-94, T1635
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 19, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 12, 2024Record 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=< 2023.9.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Home Assistant · Home Assistant Coreversion=< 2023.9.2

Published CVSS scores

8.6GitHub CNACVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
7.8NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
CWE-94Improper Control of Generation of Code ('Code Injection')
T1635Steal Application Access Token

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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