npm · Malicious package advisory
Malware@axo_cuy/baileyss
MAL-2026-18670
Malicious code in @axo_cuy/baileyss (npm)
Details
@axo_cuy/baileyss 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) 120363412451922209@newsletter (stored base64-encoded), using the victim's authenticated session and without telling them. Same behaviour as the PhantomSub family (MAL-2026-17342).
Compromised versions (3)
- 1.0.0
- 1.0.1
- 3.0.1
Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.