{"id":"MAL-2026-19044","summary":"Malicious code in yuuki-baileys (npm)","details":"yuuki-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 Yuuki-baileys/lib/Socket/newsletter.js, lib/Socket/newsletter.js sends the WhatsApp w:mex FOLLOW query for the channel ID(s) 120363406005175144@newsletter, using the victim's authenticated session and without telling them. Same behaviour as the PhantomSub family (MAL-2026-17342).","modified":"2026-11-09T23:15:37.996179815Z","published":"2026-10-27T00:00:00Z","database_specific":{"iocs":{"domains":[],"files":[{"paths":["Yuuki-baileys/lib/Socket/newsletter.js"],"digests":{"sha256":"d163e360b649838b0083e3e3cf8925c30b1570c2bcdd7af2a0e3d1b783908557"}},{"digests":{"sha256":"d163e360b649838b0083e3e3cf8925c30b1570c2bcdd7af2a0e3d1b783908557"},"paths":["lib/Socket/newsletter.js"]}],"ips":[],"urls":[]}},"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/yuuki-baileys"},{"type":"WEB","url":"https://www.ox.security/blog/phantomsub-malicious-npm-campaign-secretly-adds-users-to-whatsapp-spam-channels/"}],"affected":[{"package":{"name":"yuuki-baileys","ecosystem":"npm","purl":"pkg:npm/yuuki-baileys"},"versions":["1.0.1","2.0.0","2.1.0"],"database_specific":{"cwes":[{"description":"The product contains code that appears to be malicious in nature.","name":"Embedded Malicious Code","cweId":"CWE-506"}],"source":"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/yuuki-baileys/MAL-2026-19044.json"}}],"schema_version":"1.9.2","credits":[{"name":"CyberXYZ","contact":["https://cyberxyz.io"],"type":"FINDER"}]}