Telegram Desktop Flaw Lets Hidden JavaScript Exfiltrate Messages From HTML Exports

A flaw in Telegram Desktop let a bot's message plant hidden JavaScript inside chats that users exported to HTML files, security researchers at ExPatch said in a writeup published on September 12.

In Telegram, the message looked ordinary, with a link button, and the script ran only when someone opened the export file in a web browser. It could then copy every message in that file to

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id: 3057
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insdate: 2026-09-14 20:10:24
title: Telegram Desktop Flaw Lets Hidden JavaScript Exfiltrate Messages From HTML Exports
additional: A flaw in Telegram Desktop let a bot's message plant hidden JavaScript inside chats that users exported to HTML files, security researchers at ExPatch said in a writeup published on September 12.

In Telegram, the message looked ordinary, with a link button, and the script ran only when someone opened the export file in a web browser. It could then copy every message in that file to
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