{"id":"MAL-2026-18810","kind":"package","aliases":["MAL-2026-18810"],"related":[],"title":"Malicious code in @billabilloyy/baileys (npm)","description":"@billabilloyy/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 src/Socket/newsletter.js, src/WAUSync/Protocols/USyncNewsletterProtocol.js sends the WhatsApp w:mex FOLLOW query for the channel ID(s) 120363395678317603@newsletter, 120363400362472743@newsletter, 120363408893555851@newsletter, 120363426470081124@newsletter, 120363427718144294@newsletter and the channel invite code(s) 0029VbCX3x9Ae5VxVnDa172S, 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":"@billabilloyy/baileys","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":"2026-11-09T23:37:51+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':96C '-18810':8A,11A '-2026':7A,10A,95C '0029vbcx3x9ae5vxvnda172s':77C '120363395678317603':61C '120363400362472743':63C '120363408893555851':65C '120363426470081124':67C '120363427718144294':69C 'account':33C 'authent':82C 'bailey':21C 'behaviour':89C 'billabilloyy/baileys':4A,12A,15C 'channel':36C,58C,73C 'chosen':37C 'code':2A,45C,75C 'connect':44C 'famili':93C 'follow':54C 'fork':18C 'id':59C 'instal':29C 'invit':74C 'librari':24C 'mal':6A,9A,94C 'malici':1A,13B 'mex':53C 'newslett':62C,64C,66C,68C,70C 'npm':5A 'packag':14B 'phantomsub':92C 'publish':40C 'queri':55C 'send':49C 'session':83C 'silent':26C 'socket':43C 'src/socket/newsletter.js':47C 'src/wausync/protocols/usyncnewsletterprotocol.js':48C 'subscrib':27C 'tell':86C 'use':78C 'victim':80C 'w':52C 'web':23C 'whatsapp':22C,32C,35C,51C 'without':85C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"fix_status":null,"audience":null,"plain_action":null,"pkeys":["baileys"],"ptokens":["baileys","billabilloyy"],"labels":["critical","malicious","npm","package"],"campaign_type":null,"search_a":"'-18810':8A,11A '-2026':7A,10A 'billabilloyy/baileys':4A,12A 'code':2A 'mal':6A,9A 'malici':1A 'npm':5A","search_b":"'malici':13B 'packag':14B","search_c":"'-17342':96C '-2026':95C '0029vbcx3x9ae5vxvnda172s':77C '120363395678317603':61C '120363400362472743':63C '120363408893555851':65C '120363426470081124':67C '120363427718144294':69C 'account':33C 'authent':82C 'bailey':21C 'behaviour':89C 'billabilloyy/baileys':15C 'channel':36C,58C,73C 'chosen':37C 'code':45C,75C 'connect':44C 'famili':93C 'follow':54C 'fork':18C 'id':59C 'instal':29C 'invit':74C 'librari':24C 'mal':94C 'mex':53C 'newslett':62C,64C,66C,68C,70C 'phantomsub':92C 'publish':40C 'queri':55C 'send':49C 'session':83C 'silent':26C 'socket':43C 'src/socket/newsletter.js':47C 'src/wausync/protocols/usyncnewsletterprotocol.js':48C 'subscrib':27C 'tell':86C 'use':78C 'victim':80C 'w':52C 'web':23C 'whatsapp':22C,32C,35C,51C 'without':85C","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-2026-18810","url":"https://osv.dev/vulnerability/MAL-2026-18810","severity":"critical","published_at":"2026-10-27T00:00:00+00:00","modified_at":"2026-11-09T23:15:21+00:00","first_seen_at":"2026-11-09T23:37:51+00:00","fetched_at":"2026-11-09T23:37:51+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"}