{"id":"MAL-2026-19041","summary":"Malicious code in yazxz (npm)","details":"yazxz 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) 120363403463420361@newsletter, 120363405622645148@newsletter, 120363406290651839@newsletter, 120363422741438435@newsletter, using the victim's authenticated session and without telling them. Same behaviour as the PhantomSub family (MAL-2026-17342).","modified":"2026-11-09T23:15:38.999551335Z","published":"2026-10-27T00:00:00Z","database_specific":{"iocs":{"files":[{"paths":["lib/Socket/newsletter.js"],"digests":{"sha256":"5f3d24ef85938dcf67da19adb801b62a8b78e687603971c00d61574680d44ee6"}},{"paths":["lib/Socket/newsletter.js"],"digests":{"sha256":"a7613d62822168b4d5d734b732d424543112322870f018e1900dc4413c37df22"}}],"ips":[],"urls":[],"domains":[]}},"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/yazxz"},{"type":"WEB","url":"https://www.ox.security/blog/phantomsub-malicious-npm-campaign-secretly-adds-users-to-whatsapp-spam-channels/"}],"affected":[{"package":{"name":"yazxz","ecosystem":"npm","purl":"pkg:npm/yazxz"},"versions":["3.0.0","5.0.0"],"database_specific":{"cwes":[{"name":"Embedded Malicious Code","cweId":"CWE-506","description":"The product contains code that appears to be malicious in nature."}],"source":"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/yazxz/MAL-2026-19041.json"}}],"schema_version":"1.9.2","credits":[{"name":"CyberXYZ","contact":["https://cyberxyz.io"],"type":"FINDER"}]}