{"id":"MAL-2026-18921","summary":"Malicious code in @yun-xiao/baileys (npm)","details":"@yun-xiao/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) 120363407049212252@newsletter, 120363425547320365@newsletter, using the victim's authenticated session and without telling them. Same behaviour as the PhantomSub family (MAL-2026-17342).","modified":"2026-11-09T23:15:16.644491186Z","published":"2026-10-27T00:00:00Z","database_specific":{"iocs":{"files":[{"paths":["lib/Socket/newsletter.js"],"digests":{"sha256":"e73c006865baf3e5bd1584a8d3ef2538c0d95337585c3ae88167dcabe19f9837"}}],"ips":[],"urls":[],"domains":[]}},"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/@yun-xiao/baileys"},{"type":"WEB","url":"https://www.ox.security/blog/phantomsub-malicious-npm-campaign-secretly-adds-users-to-whatsapp-spam-channels/"}],"affected":[{"package":{"name":"@yun-xiao/baileys","ecosystem":"npm","purl":"pkg:npm/%40yun-xiao/baileys"},"versions":["2.0.0"],"database_specific":{"cwes":[{"cweId":"CWE-506","description":"The product contains code that appears to be malicious in nature.","name":"Embedded Malicious Code"}],"source":"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@yun-xiao/baileys/MAL-2026-18921.json"}}],"schema_version":"1.9.2","credits":[{"name":"CyberXYZ","contact":["https://cyberxyz.io"],"type":"FINDER"}]}