Is Amazon Book List Downloader — Kindle, Audible & More safe?

Medium risk

Amazon Book List Downloader sends the full license key to Google Analytics after successful licensed exports.

When a licensed export finishes successfully, the extension records a Google Analytics event that includes the complete license key entered by the user. That event is sent through the GA4 Measurement Protocol to Google's analytics endpoint.

App Maker Supremev2026.4.510Chrome Web Store
45Risk
Who publishes it

App Maker Supreme - no other listings under this identity

What this publisher told the store about itself, and the other listings that told it the same thing.

Publisher
App Maker Supreme
Registered address
233 E Wacker Dr, 3401, Chicago, IL 60601-5114, US
Registered contact
Vo Hong Linh Le

AI-generated. Findings may contain errors. Those marked Verified have been manually reviewed.

Publishers can request a review.

Findings

Licensed exports send the full license key to Google Analytics

When you complete a licensed export, the extension sends the entered license key as a Google Analytics event parameter.

The request goes to www.google-analytics.com/mp/collect and includes credential data associated with the export.

Severity
Medium unwanted
Type
Unexpected
CWE
CWE-522
Source
Dynamic sandbox
What actually happens
You did this

A user enters a license key and completes a licensed export.

The extension did this

The extension includes the license key in a Google Analytics download_finish event.

Captured request
POSTwww.google-analytics.com/mp/collect
Fields in the request
  • License key
    LIC-1234-ABCD-5678 (illustrative)

    This is the credential used to authorize licensed exports.

Observation

Dynamic analysis confirmed that the successful export path posts a Google Analytics Measurement Protocol event containing the license_key parameter.

What it can do

Permissions this extension asks for, as declared in version 2026.4.510. Asking for a permission is not a finding on its own - it is what the extension can do if it chooses to.

  • Read and change your data on amazon.ca

    https://*.amazon.ca/*

  • Read and change your data on amazon.co.jp

    https://*.amazon.co.jp/*

  • Read and change your data on amazon.co.uk

    https://*.amazon.co.uk/*

  • Read and change your data on amazon.com

    https://*.amazon.com/*

  • Read and change your data on amazon.com.au

    https://*.amazon.com.au/*

  • Read and change your data on amazon.com.br

    https://*.amazon.com.br/*

  • Read and change your data on amazon.com.mx

    https://*.amazon.com.mx/*

  • Read and change your data on amazon.de

    https://*.amazon.de/*

  • Read and change your data on amazon.es

    https://*.amazon.es/*

  • Read and change your data on amazon.fr

    https://*.amazon.fr/*

  • Read and change your data on amazon.in

    https://*.amazon.in/*

  • Read and change your data on amazon.it

    https://*.amazon.it/*

  • Read and change your data on amazon.nl

    https://*.amazon.nl/*

  • Read and change your data on api.lemonsqueezy.com

    https://api.lemonsqueezy.com/*

  • Start, monitor and manage your downloads

    downloads

  • Open files you have downloaded

    downloads.open

  • Store data in your browser

    storage

  • Show a panel beside the page

    sidePanel

declarativeNetRequestWithHostAccess

Where it sends data

Destinations our analysis observed Amazon Book List Downloader — Kindle, Audible & More contacting. Sending data somewhere is not a finding on its own - an extension that syncs your settings has to talk to its own server - but it is where your data can go, and who else it goes to.

  • www.google-analytics.comwidely used

    Amazon Book List Downloader — Kindle, Audible & More sends data to www.google-analytics.com. A widely used service: 346 other extensions we have analysed send data here.

Updated 30 September 2026cnmmnejiklbbkapmjegmldhaejjiejbo