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npm · Malicious package advisory

Malware

zexxo-baileys

MAL-2026-19048

Malicious code in zexxo-baileys (npm)

Details

zexxo-baileys is a fork of the Baileys WhatsApp Web library that silently subscribes the installer's own WhatsApp account to WhatsApp Channels chosen by the publisher. When the socket connects, code in dist/core/Socket/newsletter.js, lib/Socket/newsletter.js sends the WhatsApp w:mex FOLLOW query for the channel ID(s) 120363403828324716@newsletter, using the victim's authenticated session and without telling them. Same behaviour as the PhantomSub family (MAL-2026-17342).

Compromised versions (5)

  • 1.1.1
  • 1.1.2
  • 1.1.3
  • 1.2.1
  • 1.2.2

Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.