{"id":"CVE-2026-128332","kind":"vulnerability","aliases":["CVE-2026-128332"],"related":[],"title":"Listmonk: 2FA bypass lets password holders brute-force TOTP codes","description":"Listmonk 6.0.0 before 7.0.0-beta.2 contains a 2FA bypass vulnerability that allows attackers with a valid password to brute-force TOTP codes because the attempt counter resets on every new password login. Attackers can repeatedly submit credentials to POST /admin/login to obtain fresh tokens, each allowing 15 more guesses, gaining sessions for 2FA-protected accounts including Super Admin.","summary":"Listmonk 6.0.0 before 7.0.0-beta.2 resets its TOTP attempt counter on every new password login. An attacker with a valid password can keep logging in to get fresh tokens, each allowing 15 more guesses, and eventually gets a session on 2FA-protected accounts, including Super Admin.","severity":"critical","cvss":9.1,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["email-marketing","listmonk","package","self-hosted"],"not_affected_if":["auth-required","default-config"],"how_to_check":"- Check the running Listmonk version (`listmonk --version` or the admin footer); versions `6.0.0` up to but not including `7.0.0-beta.2` are affected.\n- Check whether two-factor authentication is enabled for admin users.\n- Review logs for repeated POST requests to `/admin/login` from a single source.","fix":"- Listmonk: move to `7.0.0-beta.2` or later.","status":"open","published_at":"2026-11-13T10:18:13+00:00","first_seen_at":"2026-11-13T10:47:33+00:00","triaged_at":"2026-11-13T10:48:37+00:00","updated_at":"2026-11-13T10:48:37+00:00","category":"package","confidence":0.8,"triage":{"at":"2026-11-13T10:48:37Z","model":"claude-haiku-5-5","output":{"fix":"- Listmonk: move to `7.0.0-beta.2` or later.","reach":"internet","title":"Listmonk: 2FA bypass lets password holders brute-force TOTP codes","impact":"high","summary":"Listmonk 6.0.0 before 7.0.0-beta.2 resets its TOTP attempt counter on every new password login. An attacker with a valid password can keep logging in to get fresh tokens, each allowing 15 more guesses, and eventually gets a session on 2FA-protected accounts, including Super Admin.","audience":"businesses","category":"package","nicknames":[],"who_cares":["listmonk","self-hosted","email-marketing"],"confidence":0.8,"fix_status":"available","needs_auth":"yes","worst_case":"attacker gets Super Admin session on 2FA-protected account","analyst_note":"","how_to_check":"- Check the running Listmonk version (`listmonk --version` or the admin footer); versions `6.0.0` up to but not including `7.0.0-beta.2` are affected.\n- Check whether two-factor authentication is enabled for admin users.\n- Review logs for repeated POST requests to `/admin/login` from a single source.","plain_action":"","product_name":"","needs_analyst":false,"not_affected_if":["auth-required","default-config"],"who_is_affected":"Listmonk instances running version 6.0.0 before 7.0.0-beta.2 that have TOTP two-factor authentication enabled are exposed, since the flaw is in the login flow that checks 2FA codes. An attacker still needs a valid password for the account. Instances on other versions, or without 2FA accounts, are not affected per the sources.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"yes","severity_if_unknown":"critical"},"cost_usd":0.000769,"input_tokens":4663,"output_tokens":605,"severity_before":"critical"},"analyst_status":null,"analyst_note":null,"search":"'-128332':14A,17A '-2026':13A,16A '/admin/login':113C '15':57B,120C '2fa':2A,67B,80C,127C '2fa-protected':66B,126C '6.0.0':27B,74C '7.0.0':29B,76C 'account':69B,129C 'admin':72B,132C 'allow':56B,84C,119C 'attack':42B,85C,106C 'attempt':34B,98C 'beta.2':30B,77C 'brute':8A,92C 'brute-forc':7A,91C 'bypass':3A,81C 'code':11A,95C 'contain':78C 'counter':35B,99C 'credenti':110C 'cve':12A,15A 'email':19B 'email-market':18B 'eventu':61B 'everi':37B,102C 'forc':9A,93C 'fresh':53B,116C 'gain':123C 'get':52B,62B 'guess':59B,122C 'holder':6A 'host':25B 'includ':70B,130C 'keep':48B 'let':4A 'listmonk':1A,21B,26B,73C 'log':49B 'login':40B,105C 'market':20B 'new':38B,103C 'obtain':115C 'packag':22B 'password':5A,39B,46B,89C,104C 'post':112C 'protect':68B,128C 'repeat':108C 'reset':31B,100C 'self':24B 'self-host':23B 'session':64B,124C 'submit':109C 'super':71B,131C 'token':54B,117C 'totp':10A,33B,94C 'valid':45B,88C 'vulner':82C","nicknames":[],"mitigations":[],"who_affected":"Listmonk instances running version 6.0.0 before 7.0.0-beta.2 that have TOTP two-factor authentication enabled are exposed, since the flaw is in the login flow that checks 2FA codes. An attacker still needs a valid password for the account. Instances on other versions, or without 2FA accounts, are not affected per the sources.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["critical","emailmarketing","listmonk","package","selfhosted"],"campaign_type":null,"search_a":"'-128332':14A,17A '-2026':13A,16A '2fa':2A 'brute':8A 'brute-forc':7A 'bypass':3A 'code':11A 'cve':12A,15A 'forc':9A 'holder':6A 'let':4A 'listmonk':1A 'password':5A 'totp':10A","search_b":"'15':57B '2fa':67B '2fa-protected':66B '6.0.0':27B '7.0.0':29B 'account':69B 'admin':72B 'allow':56B 'attack':42B 'attempt':34B 'beta.2':30B 'counter':35B 'email':19B 'email-market':18B 'eventu':61B 'everi':37B 'fresh':53B 'get':52B,62B 'guess':59B 'host':25B 'includ':70B 'keep':48B 'listmonk':21B,26B 'log':49B 'login':40B 'market':20B 'new':38B 'packag':22B 'password':39B,46B 'protect':68B 'reset':31B 'self':24B 'self-host':23B 'session':64B 'super':71B 'token':54B 'totp':33B 'valid':45B","search_c":"'/admin/login':113C '15':120C '2fa':80C,127C '2fa-protected':126C '6.0.0':74C '7.0.0':76C 'account':129C 'admin':132C 'allow':84C,119C 'attack':85C,106C 'attempt':98C 'beta.2':77C 'brute':92C 'brute-forc':91C 'bypass':81C 'code':95C 'contain':78C 'counter':99C 'credenti':110C 'everi':102C 'forc':93C 'fresh':116C 'gain':123C 'guess':122C 'includ':130C 'listmonk':73C 'login':105C 'new':103C 'obtain':115C 'password':89C,104C 'post':112C 'protect':128C 'repeat':108C 'reset':100C 'session':124C 'submit':109C 'super':131C 'token':117C 'totp':94C 'valid':88C 'vulner':82C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-13T10:18:13+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-128332","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-128332","severity":null,"published_at":"2026-11-13T10:18:13+00:00","modified_at":"2026-11-13T10:18:13+00:00","first_seen_at":"2026-11-13T10:47:33+00:00","fetched_at":"2026-11-13T10:47:33+00:00","note":null}],"documents":[{"id":145456,"url":"https://github.com/knadh/listmonk/commit/3f62a55c13dbc679b29238e890e4b90d6d4996d8","title":"Patch: github.com","kind":"other","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Patch: github.com"},{"id":145457,"url":"https://github.com/knadh/listmonk/releases/tag/v7.0.0-beta.2","title":"Release notes: github.com","kind":"release","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Release notes: github.com"},{"id":145458,"url":"https://www.vulncheck.com/advisories/listmonk-6.0.0-before-7.0.0-beta.2-totp-brute-force-via-admin-login-twofa","title":"Third-party advisory: www.vulncheck.com","kind":"advisory","source":"nvd","publisher":"research","text":null,"published_at":null,"relation":"advisory","confidence":null,"note":"Third-party advisory: www.vulncheck.com"}],"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"}