{"id":"CVE-2026-71456","kind":"vulnerability","aliases":["CVE-2026-71456"],"related":[],"title":"Kantech Entrapass: hard-coded crypto key enables padding oracle attacks","description":"Use of hard-coded cryptographic key vulnerability in Johnson Controls Kantech Entrapass allows Padding Oracle Crypto Attack.\n\nThis issue affects Kantech Entrapass: before 9.20.","summary":"Johnson Controls Kantech Entrapass versions before 9.20 use a hard-coded cryptographic key. An attacker can exploit this with a padding oracle attack to decrypt or forge protected data.","severity":"high","cvss":8.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["access-control","johnson-controls","kantech-entrapass","other","physical-security"],"not_affected_if":["version-9.20-or-later"],"how_to_check":"- Check the installed Entrapass version in the server or client application about screen; unknown if the sources give a specific path\n- Confirm whether the version is below `9.20`","fix":"- Upgrade Kantech Entrapass to `9.20` or later; the sources do not name a specific patched build beyond this\n- Check the vendor advisory from Johnson Controls for workarounds if an upgrade is delayed","status":"open","published_at":"2026-10-26T17:17:28+00:00","first_seen_at":"2026-10-26T17:31:22+00:00","triaged_at":"2026-10-26T17:33:02+00:00","updated_at":"2026-10-26T17:33:02+00:00","category":"other","confidence":0.5,"triage":{"at":"2026-10-26T17:33:02Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade Kantech Entrapass to `9.20` or later; the sources do not name a specific patched build beyond this\n- Check the vendor advisory from Johnson Controls for workarounds if an upgrade is delayed","reach":"unknown","title":"Kantech Entrapass: hard-coded crypto key enables padding oracle attacks","impact":"high","summary":"Johnson Controls Kantech Entrapass versions before 9.20 use a hard-coded cryptographic key. An attacker can exploit this with a padding oracle attack to decrypt or forge protected data.","category":"other","nicknames":[],"who_cares":["kantech-entrapass","physical-security","access-control","johnson-controls"],"confidence":0.5,"needs_auth":"unknown","worst_case":"Attacker decrypts or forges protected access-control data using the hard-coded key","analyst_note":"Find the Johnson Controls advisory and NVD detail to confirm the affected component, required access, and the exact check and fixed build.","how_to_check":"- Check the installed Entrapass version in the server or client application about screen; unknown if the sources give a specific path\n- Confirm whether the version is below `9.20`","needs_analyst":true,"not_affected_if":["version-9.20-or-later"],"who_is_affected":"Organizations running Kantech Entrapass versions before 9.20 for physical access control. The sources do not describe the exact data path or configuration that makes a deployment exposed, so unknown beyond the version range.","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000607,"input_tokens":3304,"output_tokens":553,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-2026':13A,16A '-71456':14A,17A '9.20':37B,85C 'access':19B 'access-control':18B 'affect':81C 'allow':74C 'attack':11A,46B,54B,78C 'code':5A,42B,65C 'control':20B,23B,32B,71C 'crypto':6A,77C 'cryptograph':43B,66C 'cve':12A,15A 'data':60B 'decrypt':56B 'enabl':8A 'entrapass':2A,26B,34B,73C,83C 'exploit':48B 'forg':58B 'hard':4A,41B,64C 'hard-cod':3A,40B,63C 'issu':80C 'johnson':22B,31B,70C 'johnson-control':21B 'kantech':1A,25B,33B,72C,82C 'kantech-entrapass':24B 'key':7A,44B,67C 'oracl':10A,53B,76C 'pad':9A,52B,75C 'physic':29B 'physical-secur':28B 'protect':59B 'secur':30B 'use':38B,61C 'version':35B 'vulner':68C","nicknames":[],"mitigations":[],"who_affected":"Organizations running Kantech Entrapass versions before 9.20 for physical access control. The sources do not describe the exact data path or configuration that makes a deployment exposed, so unknown beyond the version range.","tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-26T17:17:28+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/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":"productsecurity@jci.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-71456","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-71456","severity":null,"published_at":"2026-10-26T17:17:28+00:00","modified_at":"2026-10-26T17:17:28+00:00","first_seen_at":"2026-10-26T17:31:22+00:00","fetched_at":"2026-10-26T17:31:22+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"}