{"id":"MAL-2026-18833","kind":"package","aliases":["MAL-2026-18833"],"related":[],"title":"Malicious code in @fanzxnothuman/xbails (npm)","description":"@fanzxnothuman/xbails 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) 120363330344810280@newsletter, 120363349140729983@newsletter, 120363410018949906@newsletter, 120363410614416828@newsletter, 120363418691561888@newsletter, 120363424800295266@newsletter and 3 more (stored as base64 strings), using the victim's authenticated session and without telling them. Same behaviour as the PhantomSub family (MAL-2026-17342).","summary":null,"severity":"critical","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"@fanzxnothuman/xbails","fixed":[],"affected":"= 1.0.0","ecosystem":"npm"}],"ecosystems":["npm"],"tags":["malicious","package"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-10-27T00:00:00+00:00","first_seen_at":"2026-11-09T23:37:52+00:00","triaged_at":"2026-11-09T23:39:36+00:00","updated_at":"2026-11-09T23:39:36+00:00","category":"package","confidence":null,"triage":null,"analyst_status":null,"analyst_note":null,"search":"'-17342':97C '-18833':8A,11A '-2026':7A,10A,96C '120363330344810280':60C '120363349140729983':62C '120363410018949906':64C '120363410614416828':66C '120363418691561888':68C '120363424800295266':70C '3':73C 'account':33C 'authent':83C 'bailey':21C 'base64':77C 'behaviour':90C 'channel':36C,57C 'chosen':37C 'code':2A,45C 'connect':44C 'famili':94C 'fanzxnothuman/xbails':4A,12A,15C 'follow':53C 'fork':18C 'id':58C 'instal':29C 'lib/socket/newsletter.js':47C 'librari':24C 'mal':6A,9A,95C 'malici':1A,13B 'mex':52C 'newslett':61C,63C,65C,67C,69C,71C 'npm':5A 'packag':14B 'phantomsub':93C 'publish':40C 'queri':54C 'send':48C 'session':84C 'silent':26C 'socket':43C 'store':75C 'string':78C 'subscrib':27C 'tell':87C 'use':79C 'victim':81C 'w':51C 'web':23C 'whatsapp':22C,32C,35C,50C 'without':86C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"fix_status":null,"audience":null,"plain_action":null,"pkeys":["xbails"],"ptokens":["fanzxnothuman","xbails"],"labels":["critical","malicious","npm","package"],"campaign_type":null,"search_a":"'-18833':8A,11A '-2026':7A,10A 'code':2A 'fanzxnothuman/xbails':4A,12A 'mal':6A,9A 'malici':1A 'npm':5A","search_b":"'malici':13B 'packag':14B","search_c":"'-17342':97C '-2026':96C '120363330344810280':60C '120363349140729983':62C '120363410018949906':64C '120363410614416828':66C '120363418691561888':68C '120363424800295266':70C '3':73C 'account':33C 'authent':83C 'bailey':21C 'base64':77C 'behaviour':90C 'channel':36C,57C 'chosen':37C 'code':45C 'connect':44C 'famili':94C 'fanzxnothuman/xbails':15C 'follow':53C 'fork':18C 'id':58C 'instal':29C 'lib/socket/newsletter.js':47C 'librari':24C 'mal':95C 'mex':52C 'newslett':61C,63C,65C,67C,69C,71C 'phantomsub':93C 'publish':40C 'queri':54C 'send':48C 'session':84C 'silent':26C 'socket':43C 'store':75C 'string':78C 'subscrib':27C 'tell':87C 'use':79C 'victim':81C 'w':51C 'web':23C 'whatsapp':22C,32C,35C,50C 'without':86C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-10-27T00:00:00+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"osv-malicious","external_id":"MAL-2026-18833","url":"https://osv.dev/vulnerability/MAL-2026-18833","severity":"critical","published_at":"2026-10-27T00:00:00+00:00","modified_at":"2026-11-09T23:15:21+00:00","first_seen_at":"2026-11-09T23:37:52+00:00","fetched_at":"2026-11-09T23:37:52+00:00","note":null}],"documents":[],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}