If this package is installed
Remove it, treat the machine (or CI runner) as compromised, and rotate every secret, token and key it could access — from a different, clean machine.
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).
Version 4.0.0 (published 2026-11-05, the latest release when checked) keeps this behaviour. Its lib/Socket/newsletter.js is byte-identical to that of 3.0.1 (sha256 a72abc445c6f71496fa9cb7e3df892eea508ff00711d199d410c04fe3c9a74f4), and every other file on the socket chain from makeWASocket to makeNewsletterSocket is byte-identical to 3.0.1 except lib/Socket/socket.js, whose only change is the default pairing code. 10 seconds after the socket is created, makeNewsletterSocket sends the FOLLOW for the base64-stored channel ID; errors are swallowed and the user is not told. The autoFollow: true default in lib/Defaults/index.js is never read, so it cannot turn the follow off. CyberXYZ added this version after reading it statically on 2026-11-06; nothing was executed.