{"id":"MAL-2026-18942","kind":"package","aliases":["MAL-2026-18942"],"related":[],"title":"Malicious code in baileys-multidev (npm)","description":"baileys-multidev 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 a list downloaded at runtime from https://raw.githubusercontent.com/ZackRylsen/Assets/refs/heads/main/config/ChannelId.json, 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":"baileys-multidev","fixed":[],"affected":"= 8.0.2","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":"2026-11-09T23:37:58+00:00","triaged_at":"2026-11-09T23:43:42+00:00","updated_at":"2026-11-09T23:43:42+00:00","category":"package","confidence":null,"triage":null,"analyst_status":null,"analyst_note":null,"search":"'-17342':89C '-18942':10A,13A '-2026':9A,12A,88C '/zackrylsen/assets/refs/heads/main/config/channelid.json,':70C 'account':39C 'authent':75C 'bailey':5A,20C,27C 'baileys':15A 'baileys-multidev':4A,14A,19C 'behaviour':82C 'channel':42C 'chosen':43C 'code':2A,51C 'connect':50C 'download':64C 'famili':86C 'follow':59C 'fork':24C 'instal':35C 'lib/socket/newsletter.js':53C 'librari':30C 'list':63C 'mal':8A,11A,87C 'malici':1A,17B 'mex':58C 'multidev':6A,16A,21C 'npm':7A 'packag':18B 'phantomsub':85C 'publish':46C 'queri':60C 'raw.githubusercontent.com':69C 'raw.githubusercontent.com/zackrylsen/assets/refs/heads/main/config/channelid.json,':68C 'runtim':66C 'send':54C 'session':76C 'silent':32C 'socket':49C 'subscrib':33C 'tell':79C 'use':71C 'victim':73C 'w':57C 'web':29C 'whatsapp':28C,38C,41C,56C 'without':78C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"fix_status":null,"audience":null,"plain_action":null,"pkeys":["baileysmultidev"],"ptokens":["baileys","multidev"],"labels":["critical","malicious","npm","package"],"campaign_type":null,"search_a":"'-18942':10A,13A '-2026':9A,12A 'bailey':5A 'baileys':15A 'baileys-multidev':4A,14A 'code':2A 'mal':8A,11A 'malici':1A 'multidev':6A,16A 'npm':7A","search_b":"'malici':17B 'packag':18B","search_c":"'-17342':89C '-2026':88C '/zackrylsen/assets/refs/heads/main/config/channelid.json,':70C 'account':39C 'authent':75C 'bailey':20C,27C 'baileys-multidev':19C 'behaviour':82C 'channel':42C 'chosen':43C 'code':51C 'connect':50C 'download':64C 'famili':86C 'follow':59C 'fork':24C 'instal':35C 'lib/socket/newsletter.js':53C 'librari':30C 'list':63C 'mal':87C 'mex':58C 'multidev':21C 'phantomsub':85C 'publish':46C 'queri':60C 'raw.githubusercontent.com':69C 'raw.githubusercontent.com/zackrylsen/assets/refs/heads/main/config/channelid.json,':68C 'runtim':66C 'send':54C 'session':76C 'silent':32C 'socket':49C 'subscrib':33C 'tell':79C 'use':71C 'victim':73C 'w':57C 'web':29C 'whatsapp':28C,38C,41C,56C 'without':78C","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-2026-18942","url":"https://osv.dev/vulnerability/MAL-2026-18942","severity":"critical","published_at":"2026-10-27T00:00:00+00:00","modified_at":"2026-11-09T23:15:27+00:00","first_seen_at":"2026-11-09T23:37:58+00:00","fetched_at":"2026-11-09T23:37:58+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"}