Security Warning: Historically Flagged as Malware

This extension is historically labeled as malware, but the current version analysis does not yet confirm severe malicious findings.Extension: Web Client for Telegram™ - Teleside

HIGH RISKStill available - needs review

Web Client for Telegram™ - Teleside

ID: mdcfennpfgkngnibjbpnpaafcjnhcjno

Supported Languages

🇸🇦Arabic

🇧🇬Bulgarian

🇨🇳Chinese (Simplified)

🇹🇼Chinese (Traditional)

🇭🇷Croatian

🇨🇿Czech

🇩🇰Danish

🇳🇱Dutch

🇺🇸English

🇪🇪Estonian

🇵🇭Filipino

🇫🇮Finnish

🇫🇷French

🇩🇪German

🇬🇷Greek

🇮🇱Hebrew

🇭🇺Hungarian

🇮🇩Indonesian

🇮🇹Italian

🇯🇵Japanese

🇰🇷Korean

🇱🇻Latvian

🇱🇹Lithuanian

🇳🇴Norwegian

🇮🇷Persian

🇵🇱Polish

🇷🇴Romanian

🇷🇺Russian

🇷🇸Serbian

🇸🇰Slovak

🇸🇮Slovenian

🇪🇸Spanish

🇸🇪Swedish

🇹🇭Thai

🇹🇷Turkish

🇺🇦Ukrainian

🇻🇳Vietnamese

Extension Info & Metadata

Status

Active

Version

3.9.1

Size

0.75 MB

Rating

5.0/5

Reviews

Users

2,000

Type

Extension

Updated

Jul 30, 2026

Publisher Contextual Analysis

Author: Yana ProjectView Profile
Privacy: Privacy Policy
Help: Help Center
Country: DE
MX records exist: Yes
Domain exists: Yes
Is disposable: No
Is role-based: No
Mailbox exists: Yes
Address: Ringelsweide 28 Düsseldorf 40223 DE
Website: Visit

Total Extensions

Active

Obsolete

Listed

Unlisted

Total Users

2,564

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Run web client for Telegram™ just like your favorite mobile app.

Run web client for Telegram™ just like your favorite mobile app. Download videos and images, upload your own content, and send DM. Teleside | Web Client for Telegram™ is a useful Chrome extension that allows users to experience the popular social media platform. This is a simple and powerful tool with many features to make your social user experience even better. With one click in your browser, you will be taken to the popular social network - Telegram, where you can share photos and videos, view the news feed and chat with friends.

User Growth

Showing data from May 31, 2024 to May 31, 2025

Versions

+100%(+1,000 users)

Compared to 3 months ago

4 versions released in this period

Rating Count

Total: 4 ratings

Average Rating

Current: 5.00 / 5.0+5.00

Extracted Data

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By severity

Critical2

High2

Medium3

Low0

Versions scanned

Showing 1 of 8 scanned versions with more than one unique finding. Counts are unique findings that include each version.

Extension Version	Code Review Findings
3.8.1 Code review	7

Extension Version	Code Review Findings
3.8.1	7

Files with findings

4 distinct paths — top paths by unique finding count:

background.js2
manifest.json2
rules_1.json2
content-sidebar.html1

S.No.	Category	Severity	File	Summary	Found in Version
1	Network Interception	critical	rules_1.json (line 43)	The declarativeNetRequest ruleset strips Content-Security-Policy, CSP-Report-Only, and X-Frame-Options from all web.telegram.org responses, and forces Access-Control-Allow-Origin: *. This intentionally disables core b…	3.8.1
2	Network Interception	critical	rules_1.json (line 7)	Requests to web.telegram.org have their Origin, Referer, User-Agent, and Sec-Fetch-* headers rewritten (forcing a fake iPhone Safari UA and same-origin fetch metadata). This bypasses Telegram's anti-CSRF/anti-iframe h…	3.8.1
3	Phishing	high	content-sidebar.html (line 25)	The side panel HTML injects a fixed-position overlay (z-index 9999) with a clickable image linking to https://multiaccount.cloudapi.stream/game.html — an unrelated third-party domain. The image is auto-loaded from the…	3.8.1
4	Tracking	high	background.js (line 6186)	On install, the extension forcibly opens a tab to cloudapi.stream/install/ and registers cloudapi.stream/uninstall/ as the uninstall URL. Combined with the random per-user ID generated and stored in extension storage …	3.8.1
5	Privilege Escalation	medium	manifest.json (line 38)	The extension requests <all_urls> host permission despite only needing web.telegram.org, and exposes every packaged resource ('*') to every origin ('<all_urls>') via web_accessible_resources. This gives arbitrary webs…	3.8.1
6	Tracking	medium	background.js (line 6172)	Generates a pseudo-random persistent user identifier on first run and writes it to chrome.storage. This identifier, when paired with the install/uninstall webhooks to cloudapi.stream, enables cross-session user tracki…	3.8.1
7	Unauthorized Data Collection	medium	manifest.json (line 23)	A ~3,700-line jQuery bundle (sys-content.js) is injected into every frame of every telegram.org subdomain at document_start. Running a full DOM manipulation toolkit as the very first script in a credentialed messaging…	3.8.1

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URLs

IPv4

IPv6

URLs

View the external URLs this extension communicates with to understand its network activity and data interactions.

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www.w3.org	/1999/xlink	http://www.w3.org/1999/xlink
www.w3.org	/2000/svg	http://www.w3.org/2000/svg
www.w3.org	/1998/Math/MathML	http://www.w3.org/1998/Math/MathML
julia-info.kiev.ua	/install/1	https://julia-info.kiev.ua/install/1
multiaccount.cloudapi.stream	/game.html	https://multiaccount.cloudapi.stream/game.html
multiaccount.cloudapi.stream	/game_image.jpg	https://multiaccount.cloudapi.stream/game_image.jpg?1
github.com	/facebook/regenerator/blob/main/LICENSE	https://github.com/facebook/regenerator/blob/main/LICENSE
feross.org	-	http://feross.org
feross.org	/opensource	https://feross.org/opensource
web.telegram.org	/k/	https://web.telegram.org/k/

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No IP addresses found

5.0 out of 5 · 1 most recent review

Text reviews

Positive

Negative

Good extension!

Margo Frolova·5 Jul 2024

Version History

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Code Diff

Compare extension code between any two versions.

0 changed files detected

No comparable text files found between these versions.

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Browse and explore files within this extension package

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Security Warning: Historically Flagged as Malware

Web Client for Telegram™ - Teleside

Supported Languages

Extension Info & Metadata

Publisher Contextual Analysis

Chrome Web Store Metadata

Screenshots & Videos

About this extension

Analytics & Metrics

User Growth

Rating Count

Average Rating

Static Code Security Analysis

Extracted Data

Code Review Findings Summary Across 8 Versions7

Versions scanned

Files with findings

Extracted Indicators (URLs and IPs)

URLs

Contextual Analysis

User Reviews

Version History

Version-to-Version Code Diff

Code Diff

Extension Files

User Reviews

User Growth

Rating Count

Average Rating