{"id":"CVE-2026-108709","kind":"vulnerability","aliases":["CVE-2026-108709"],"related":[],"title":"Authentication bypass within in-house network in Apache Kylin","description":"Authentication bypass within in-house network in Apache Kylin. Impact most to the kylin services that are directly exposed to public network, which is not common. In-house kylin deployments are mostly not impacted.\n\n\n\nThis issue affects Apache Kylin: from 4.0.4 through 5.0.4.\n\n\n\nUsers are recommended to upgrade to version 5.0.5, which fixes the issue.","summary":"Apache Kylin versions 4.0.4 through 5.0.4 contain an authentication bypass that lets a remote attacker get past login on the Kylin service. The sources state the flaw is most dangerous when Kylin is directly exposed to the public internet, and that in-house deployments are mostly not affected.","severity":"critical","cvss":9.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["apache-kylin","data-platform","package","self-hosted"],"not_affected_if":["in-house-only-network","versions-outside-4.0.4-to-5.0.4"],"how_to_check":"Check the deployed Kylin version against 4.0.4 through 5.0.4\nCheck whether the Kylin service port is reachable from the public internet","fix":"Upgrade Apache Kylin to version 5.0.5","status":"open","published_at":"2026-10-16T20:17:18+00:00","first_seen_at":"2026-10-23T21:57:14+00:00","triaged_at":"2026-10-23T22:04:56+00:00","updated_at":"2026-10-23T22:28:55+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-23T22:04:56Z","model":"claude-haiku-5-5","output":{"fix":"Upgrade Apache Kylin to version 5.0.5\nUnknown for 4.x releases: sources do not name a fixed 4.x version","reach":"internet","impact":"high","summary":"Apache Kylin versions 4.0.4 through 5.0.4 contain an authentication bypass that lets a remote attacker get past login on the Kylin service. The sources state the flaw is most dangerous when Kylin is directly exposed to the public internet, and that in-house deployments are mostly not affected.","category":"package","who_cares":["apache-kylin","self-hosted","data-platform"],"confidence":0.6,"needs_auth":"no","worst_case":"Unauthenticated attacker bypasses login and gets Kylin admin access","analyst_note":"Confirm whether 4.x releases have a fixed version and find the NVD or Apache advisory for exact affected scope and the bypass mechanism.","how_to_check":"Check the deployed Kylin version against 4.0.4 through 5.0.4\nCheck whether the Kylin service port is reachable from the public internet\nunknown","needs_analyst":true,"not_affected_if":["in-house-only-network","versions-outside-4.0.4-to-5.0.4"],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"critical"},"cost_usd":0.000507,"input_tokens":2787,"output_tokens":457,"severity_before":"critical"},"analyst_status":null,"analyst_note":null,"search":"'-108709':13A,16A '-2026':12A,15A '4.0.4':30B,118C '5.0.4':32B,120C '5.0.5':128C 'affect':75B,114C 'apach':9A,18B,27B,84C,115C 'apache-kylin':17B 'attack':41B 'authent':1A,35B,76C 'bypass':2A,36B,77C 'common':102C 'contain':33B 'cve':11A,14A 'danger':56B 'data':21B 'data-platform':20B 'deploy':71B,107C 'direct':60B,94C 'expos':61B,95C 'fix':130C 'flaw':53B 'get':42B 'host':26B 'hous':6A,70B,81C,105C 'impact':86C,111C 'in-hous':4A,68B,79C,103C 'internet':65B 'issu':113C,132C 'kylin':10A,19B,28B,47B,58B,85C,90C,106C,116C 'let':38B 'login':44B 'most':73B,109C 'network':7A,82C,98C 'packag':23B 'past':43B 'platform':22B 'public':64B,97C 'recommend':123C 'remot':40B 'self':25B 'self-host':24B 'servic':48B,91C 'sourc':50B 'state':51B 'upgrad':125C 'user':121C 'version':29B,127C 'within':3A,78C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-16T20:17:18+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_by":"134c704f-9b21-4f2e-91b3-4a467353bcc0","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-108709","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-108709","severity":null,"published_at":"2026-10-16T20:17:18+00:00","modified_at":"2026-10-20T19:17:28+00:00","first_seen_at":"2026-10-23T21:57:14+00:00","fetched_at":"2026-10-23T22:28:55+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}