---
id: CVE-2026-82928
title: >-
  mH-DEVELOPER smart home module contains a hardcoded SSH public key in
  /root/.ssh/authorized_keys, serving as a potential backdoor
summary: >-
  mH-DEVELOPER smart home module contains a hardcoded SSH public key in
  /root/.ssh/authorized_keys, serving as a potential backdoor. The SSH daemon
  allows root login via key authentication and starts automatically. An attacker
  with the mat…
severity: high
cvss: 7.7
cvssVector: 'CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'
cwe:
  - CWE-1242
vendor: F&F Filipowski
product: mH-DEVELOPER
affected:
  - mH-DEVELOPER < 3.0.30
published: '2026-09-28'
updated: '2026-09-28'
sourceUpdated: '2026-09-28T13:17:23.253'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-82928'
references:
  - url: 'https://cert.pl/posts/2026/09/CVE-2026-82928/'
    label: cvd@cert.pl
  - url: 'https://www.fif.com.pl/pl/strona-glowna/1367-mh-developer.html'
    label: cvd@cert.pl
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-09-28T13:09:42.239Z'
---

## Overview

mH-DEVELOPER smart home module contains a hardcoded SSH public key in /root/.ssh/authorized_keys, serving as a potential backdoor. The SSH daemon allows root login via key authentication and starts automatically. An attacker with the matching private key can gain a root shell on any affected device, resulting in full system compromise. The key cannot be removed without remounting the file system and survives a factory reset. Vendor notes that this functionality was used only for service purposes.


This issue was fixed in version 3.0.30

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.