Vulnerability MAL-2026-18871
Summary
Malicious code in @pahinak/bails (npm)
Details
@pahinak/bails 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) 120363349140729983@newsletter, 120363410018949906@newsletter, 120363424800295266@newsletter, 120363425177067841@newsletter, 120363425869049995@newsletter, 120363428745722504@newsletter (stored as base64 strings), using the victim's authenticated session and without telling them. Same behaviour as the PhantomSub family (MAL-2026-17342).