---
id: "CVE-2026-71456"
kind: "vulnerability"
aliases: ["CVE-2026-71456"]
title: "Kantech Entrapass: hard-coded crypto key enables padding oracle attacks"
severity: "high"
cvss: 8.5
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["access-control", "johnson-controls", "kantech-entrapass", "other", "physical-security"]
not_affected_if: ["version-9.20-or-later"]
published_at: "2026-10-26T17:17:28+00:00"
first_seen_at: "2026-10-26T17:31:22+00:00"
updated_at: "2026-10-26T17:33:02+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-71456", "first_seen_at": "2026-10-26T17:31:22+00:00"}]
---

# Kantech Entrapass: hard-coded crypto key enables padding oracle attacks

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.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Entrapass version in the server or client application about screen; unknown if the sources give a specific path
- 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
- Check the vendor advisory from Johnson Controls for workarounds if an upgrade is delayed

## Timeline

- 2026-10-26T17:31:22+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-71456

## From the sources

Use of hard-coded cryptographic key vulnerability in Johnson Controls Kantech Entrapass allows Padding Oracle Crypto Attack.

This issue affects Kantech Entrapass: before 9.20.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_