{"id":"CVE-2026-105671","kind":"vulnerability","aliases":["CVE-2026-105671"],"related":[],"title":"Zenitel Connect login reveals which usernames exist","description":"The login flow in Zenitel Connect before 1.11.0 returns different error responses depending on whether a submitted username exists, which allows remote attackers to enumerate valid user accounts via crafted login requests.","summary":"The login page in Zenitel Connect before 1.11.0 returns different error messages for existing and non-existing usernames. An remote attacker can use crafted login requests to learn which accounts are valid, which helps them target password guessing.","severity":"medium","cvss":6.9,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["other","zenitel-connect"],"not_affected_if":["version-1.11.0-or-later"],"how_to_check":"- Check the installed Zenitel Connect version against the range before `1.11.0`","fix":"- Upgrade Zenitel Connect to `1.11.0` or later","status":"open","published_at":"2026-11-13T16:17:23+00:00","first_seen_at":"2026-11-13T16:47:32+00:00","triaged_at":"2026-11-13T16:48:46+00:00","updated_at":"2026-11-13T16:48:46+00:00","category":"other","confidence":0.6,"triage":{"at":"2026-11-13T16:48:46Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade Zenitel Connect to `1.11.0` or later\n- unknown","reach":"internet","title":"Zenitel Connect login reveals which usernames exist","impact":"low","summary":"The login page in Zenitel Connect before 1.11.0 returns different error messages for existing and non-existing usernames. An remote attacker can use crafted login requests to learn which accounts are valid, which helps them target password guessing.","audience":"businesses","category":"other","nicknames":[],"who_cares":["zenitel-connect"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"Attacker learns valid usernames for password guessing attacks","analyst_note":"","how_to_check":"- Check the installed Zenitel Connect version against the range before `1.11.0`\n- unknown","plain_action":"","product_name":"","needs_analyst":false,"not_affected_if":["version-1.11.0-or-later"],"who_is_affected":"Organizations running Zenitel Connect versions before 1.11.0 with a reachable login page. The sources do not describe further configuration conditions. unknown","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000664,"input_tokens":4520,"output_tokens":423,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-105671':10A,13A '-2026':9A,12A '1.11.0':25B,64C 'account':48B,84C 'allow':77C 'attack':39B,79C 'connect':2A,17B,23B,62C 'craft':42B,86C 'cve':8A,11A 'depend':69C 'differ':27B,66C 'enumer':81C 'error':28B,67C 'exist':7A,31B,35B,75C 'flow':59C 'guess':56B 'help':52B 'learn':46B 'login':3A,19B,43B,58C,87C 'messag':29B 'non':34B 'non-exist':33B 'page':20B 'password':55B 'remot':38B,78C 'request':44B,88C 'respons':68C 'return':26B,65C 'reveal':4A 'submit':73C 'target':54B 'use':41B 'user':83C 'usernam':6A,36B,74C 'valid':50B,82C 'via':85C 'whether':71C 'zenitel':1A,16B,22B,61C 'zenitel-connect':15B","nicknames":[],"mitigations":[],"who_affected":"Organizations running Zenitel Connect versions before 1.11.0 with a reachable login page. The sources do not describe further configuration conditions. unknown","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["medium","other","zenitelconnect"],"campaign_type":null,"search_a":"'-105671':10A,13A '-2026':9A,12A 'connect':2A 'cve':8A,11A 'exist':7A 'login':3A 'reveal':4A 'usernam':6A 'zenitel':1A","search_b":"'1.11.0':25B 'account':48B 'attack':39B 'connect':17B,23B 'craft':42B 'differ':27B 'error':28B 'exist':31B,35B 'guess':56B 'help':52B 'learn':46B 'login':19B,43B 'messag':29B 'non':34B 'non-exist':33B 'page':20B 'password':55B 'remot':38B 'request':44B 'return':26B 'target':54B 'use':41B 'usernam':36B 'valid':50B 'zenitel':16B,22B 'zenitel-connect':15B","search_c":"'1.11.0':64C 'account':84C 'allow':77C 'attack':79C 'connect':62C 'craft':86C 'depend':69C 'differ':66C 'enumer':81C 'error':67C 'exist':75C 'flow':59C 'login':58C,87C 'remot':78C 'request':88C 'respons':68C 'return':65C 'submit':73C 'user':83C 'usernam':74C 'valid':82C 'via':85C 'whether':71C 'zenitel':61C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-13T16:17:23+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/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":"cf9c5165-6fe5-4ec0-b5f1-404f1df30a4e","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-105671","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-105671","severity":null,"published_at":"2026-11-13T16:17:23+00:00","modified_at":"2026-11-13T16:17:23+00:00","first_seen_at":"2026-11-13T16:47:32+00:00","fetched_at":"2026-11-13T16:47:32+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"}