{"id":"MAL-2026-18919","kind":"package","aliases":["MAL-2026-18919"],"related":[],"title":"Malicious code in @yemo-dev/yebail (npm)","description":"@yemo-dev/yebail 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/messages-recv.js sends the WhatsApp w:mex FOLLOW query for the channel ID(s) 120363408975923153@newsletter, 120363421171049265@newsletter (stored as character-code arrays), 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":"@yemo-dev/yebail","fixed":[],"affected":"= 1.0.0; = 1.0.1; = 1.1.0; = 1.1.1; = 1.1.2; = 1.1.3; = 1.1.4; = 1.2.0; = 1.2.1; = 2.0.0; = 2.0.1; = 2.0.2; = 3.0.1; = 3.0.2; = 3.0.3; = 3.0.4; = 3.0.5; = 3.0.6; = 4.0.0; = 4.0.1; = 4.0.2; = 4.0.3; = 4.0.4; = 4.0.5; = 4.1.0; = 4.1.1; = 4.1.2; = 4.1.3; = 4.1.4; = 4.1.5; = 4.1.6; = 4.2.0; = 4.2.1; = 4.2.10; = 4.2.11; = 4.2.12; = 4.2.2; = 4.2.3; = 4.2.4; = 4.2.5; = 4.2.6; = 4.2.7; = 4.2.8; = 4.2.9","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":"2026-11-09T23:38:01+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':97C '-18919':11A,14A '-2026':10A,13A,96C '/yebail':7A,18A,24C '120363408975923153':69C '120363421171049265':71C 'account':42C 'array':78C 'authent':83C 'bailey':30C 'behaviour':90C 'channel':45C,66C 'charact':76C 'character-cod':75C 'chosen':46C 'code':2A,54C,77C 'connect':53C 'dev':6A,17A,23C 'famili':94C 'follow':62C 'fork':27C 'id':67C 'instal':38C 'lib/socket/messages-recv.js':56C 'librari':33C 'mal':9A,12A,95C 'malici':1A,19B 'mex':61C 'newslett':70C,72C 'npm':8A 'packag':20B 'phantomsub':93C 'publish':49C 'queri':63C 'send':57C 'session':84C 'silent':35C 'socket':52C 'store':73C 'subscrib':36C 'tell':87C 'use':79C 'victim':81C 'w':60C 'web':32C 'whatsapp':31C,41C,44C,59C 'without':86C 'yemo':5A,16A,22C 'yemo-dev':4A,15A,21C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"fix_status":null,"audience":null,"plain_action":null,"pkeys":["yebail"],"ptokens":["dev","yebail","yemo"],"labels":["critical","malicious","npm","package"],"campaign_type":null,"search_a":"'-18919':11A,14A '-2026':10A,13A '/yebail':7A,18A 'code':2A 'dev':6A,17A 'mal':9A,12A 'malici':1A 'npm':8A 'yemo':5A,16A 'yemo-dev':4A,15A","search_b":"'malici':19B 'packag':20B","search_c":"'-17342':97C '-2026':96C '/yebail':24C '120363408975923153':69C '120363421171049265':71C 'account':42C 'array':78C 'authent':83C 'bailey':30C 'behaviour':90C 'channel':45C,66C 'charact':76C 'character-cod':75C 'chosen':46C 'code':54C,77C 'connect':53C 'dev':23C 'famili':94C 'follow':62C 'fork':27C 'id':67C 'instal':38C 'lib/socket/messages-recv.js':56C 'librari':33C 'mal':95C 'mex':61C 'newslett':70C,72C 'phantomsub':93C 'publish':49C 'queri':63C 'send':57C 'session':84C 'silent':35C 'socket':52C 'store':73C 'subscrib':36C 'tell':87C 'use':79C 'victim':81C 'w':60C 'web':32C 'whatsapp':31C,41C,44C,59C 'without':86C 'yemo':22C 'yemo-dev':21C","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-2026-18919","url":"https://osv.dev/vulnerability/MAL-2026-18919","severity":"critical","published_at":"2026-10-27T00:00:00+00:00","modified_at":"2026-11-09T23:15:29+00:00","first_seen_at":"2026-11-09T23:38:01+00:00","fetched_at":"2026-11-09T23:38:01+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"}