Is FuseBase Assistant - AI Chat and Agents safe?

Low risk

FuseBase Assistant accepts session IDs from any webpage and sends them as Nimbus/FuseBase API headers.

The extension runs a content script on every HTTP and HTTPS page and accepts a page message containing a session ID without checking the sender origin. It stores that value as its Nimbus session ID and later includes it in EverHelper-Session-ID headers when calling Nimbus/FuseBase APIs for capture, upload, premium checks, and sync actions. Those requests can include stored extension data, page URLs, page titles, and page content depending on the action.

Part of this rating comes from analysis signals we haven't published as detailed findings yet.

Nimbus Web Incv5.2.9Chrome Web Store
17Risk
Who publishes it

NIMBUS WEB, INC. - 2 other listings from the same operator, none carrying a finding

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

Publisher
Nimbus Web Inc
Declared legal entity
NIMBUS WEB, INC.
Registered address
6815 Euclid Ave, Cleveland, OH 44103, US
Registered contact
Pavel Shcherbakov

Same store account

2 other listings published from this account, 11k+ users between them, none of them carrying a finding.

Shared hosts - 1 hostname

Hostnames hardcoded in this extension that few other listings call. That can mean one operator behind both, and it can equally mean a small shared vendor, so it is context rather than a conclusion. Hosts that many listings call are left out: they are services, not connections.

nimb.ws
Also called by 5 other listings, including ClassroomGo - AI無邊際 (老師), Nimbus Screen Capture: Screenshot, Edit, Annotate

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

Publishers can request a review.

What it can do

Permissions this extension asks for, as declared in version 5.2.9. 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 every site you visit

    <all_urls>

  • Store data in your browser

    storage

  • Run its own code inside the pages you visit

    scripting

  • Show a panel beside the page

    sidePanel

  • Add items to the right-click menu

    contextMenus

  • Capture the video and audio of a tab

    tabCapture

Where it sends data

Destinations our analysis observed FuseBase Assistant - AI Chat and Agents 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.

  • sync.nimbusweb.me

    FuseBase Assistant - AI Chat and Agents sends data to sync.nimbusweb.me. One other extension we have analysed sends data here.

  • app.nimbusweb.me

    FuseBase Assistant - AI Chat and Agents sends data to app.nimbusweb.me. No other extension we have analysed sends data here.

  • capture-pro.nimbusweb.me

    FuseBase Assistant - AI Chat and Agents sends data to capture-pro.nimbusweb.me. No other extension we have analysed sends data here.

Updated 30 September 2026haafigbapbpbpnmgcknnmilaaaimggpk