Is AI Sidebar | DeepSeek, Gemini, Claude, GPT safe?

Medium risk

DeepSider is medium risk. Dynamic analysis captured DeepSider fetching a JSON config from Alibaba OSS and Tencent COS on every load. The file lists URLs replacing built-in API, upload, and media-proxy endpoints. Whoever controls that bucket can redirect all traffic.

DeepSiderv3.2.8Chrome Web Store
45Risk
Who publishes it

DeepSider - no other listings under this identity, 2 shared hostnames

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

Publisher
DeepSider

Shared hosts - 2 hostnames

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.

middle.filesystemapi.site
Also called by 3 other listings, including HiSider: Multi-Model Assistant
img.chatgot.io
Also called by 4 other listings, including HiSider: Multi-Model Assistant, Chatgot - Free DeepSeek R1 AI Assistant

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

Publishers can request a review.

Findings

API Endpoints Overridable via Third-Party CDN Config

Dynamic analysis captured DeepSider fetching a JSON config from Alibaba OSS and Tencent COS on every load.

The file lists URLs replacing built-in API, upload, and media-proxy endpoints.

Whoever controls that bucket can redirect all traffic.

Severity
Medium unwanted
Type
Unexpected
CWE
CWE-829
Source
Dynamic sandbox
What actually happens
You did this

You install or restart DeepSider.

The extension did this

The extension fetches a JSON file from Alibaba Cloud OSS and Tencent Cloud COS that can replace every API and upload endpoint it uses.

The replacement happens before any user interaction. All subsequent network requests, AI queries, file uploads, media proxying, go to whichever hosts the CDN response names.

Captured request
GEThttps://api-static-domai.oss-cn-beijing.aliyuncs.com/hosts-prod.json
Headers
Accept
application/json, text/plain, */*
Third-party destinations
    • api-static-domai.oss-cn-beijing.aliyuncs.com

    Primary host-config source (Alibaba Cloud OSS bucket)

    • api-static-domai-1308089883.cos.ap-guangzhou.myqcloud.com

    Fallback host-config source (Tencent Cloud COS bucket)

    • web.public.deepsider.pro

    Second fallback host-config source

Observation

The current JSON contents of all three CDN sources are deepsider-controlled and point to legitimate deepsider.ai/net/pro infrastructure. The risk is conditional: it materializes if any of the three cloud storage buckets is misconfigured for public write access, or if an actor with bucket credentials modifies the file. No such compromise has been observed. The extension performs no signature verification or hostname allowlist check on the returned URLs beyond confirming they start with 'http'.

Updated 30 September 2026dfbnddndcmilnhdfmmaolepiaefacnpo