Vulnerability MAL-2026-18830
Summary
Malicious code in @fadelsm/baileys (npm)
Details
@fadelsm/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 lib/Socket/newsletter.js sends the WhatsApp w:mex FOLLOW query for the channel ID(s) 120363400362472743@newsletter, 120363406524087186@newsletter, 120363407144637058@newsletter, 120363408367338249@newsletter, 120363409508273158@newsletter, 12036340982021544@newsletter and 4 more (stored as character-code arrays), using the victim's authenticated session and without telling them. Same behaviour as the PhantomSub family (MAL-2026-17342).