---
id: CVE-2026-77056
title: Use of Default Credentials in boneIO
summary: >-
  boneIO black_debian_images ships with a Mosquitto MQTT broker that uses the
  same default credentials on all devices. These credentials are publicly
  documented on github, and there is no indication in the instructions to change
  them. A re…
severity: high
cvss: 7.1
cvssVector: 'CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-1392
vendor: boneIO
product: black_debian_images
affected:
  - black_debian_images >= 1.2.0 < 1.6.0
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-26T16:25:44.166478Z'
published: '2026-10-26'
updated: '2026-10-26'
sourceUpdated: '2026-10-26T16:46:44.867Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-77056'
references:
  - url: 'https://cert.pl/en/posts/2026/10/CVE-2026-77052'
  - url: 'https://boneio.eu/en/docs/black'
tags:
  - cve.org
ingestedAt: '2026-10-26T15:29:30.513Z'
---

## Overview

boneIO black_debian_images ships with a Mosquitto MQTT broker that uses the same default credentials on all devices. These credentials are publicly documented on github, and there is no indication in the instructions to change them. A remote attacker can use them to gain full read and write access to the broker, allowing control of connected relays, blinds, and gates, and injection of fake entities into a linked Home Assistant installation.

This issue was fixed in version 1.6.0 of the image: MQTT passwords are generated per device at first boot. Devices upgraded from earlier versions keep their existing broker credentials; from boneio 1.6.0 the web panel reports credentials that are still the published defaults, and the owner has to change them.

## Affected

- `black_debian_images >= 1.2.0 < 1.6.0`

## Remediation

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