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Telegram Desktop Flaw Lets Hidden JavaScript Exfiltrate Messages From HTML Exports

The Hacker News

Overview

A security flaw in Telegram Desktop has been discovered that allows malicious bots to insert hidden JavaScript into messages. Researchers from ExPatch reported that users who export their chats to HTML files could unknowingly execute this script when opening the file in a web browser. This script can then copy all messages from the exported file, posing a significant privacy risk. The issue affects anyone using Telegram Desktop who exports their chat messages, potentially compromising sensitive information. Users should be cautious when exporting chats and opening files from untrusted sources to mitigate this risk.

Key Takeaways

  • Affected Systems: Telegram Desktop
  • Action Required: Users should avoid opening HTML exports from untrusted sources and consider updating to the latest version of Telegram Desktop if a patch is released.
  • Timeline: Disclosed on September 12, 2023

Original Article Summary

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

Impact

Telegram Desktop

Exploitation Status

The exploitation status is currently unknown. Monitor vendor advisories and security bulletins for updates.

Timeline

Disclosed on September 12, 2023

Remediation

Users should avoid opening HTML exports from untrusted sources and consider updating to the latest version of Telegram Desktop if a patch is released.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

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