---
title: "CVE-2026-77056: boneIO black_debian_images - Authentication Bypass"
description: "boneIO black_debian_images before 1.6.0 contains a broken authentication caused by use of default MQTT broker credentials, letting remote attackers gain full read/write access to the broker and control connected devices, exploit requires use of default credentials."
url: https://panop.io/threat-heartbeat/CVE-2026-77056/
---

# CVE-2026-77056 boneIO black\_debian\_images - Authentication Bypass

boneIO black\_debian\_images before 1.6.0 contains a broken authentication caused by use of default MQTT broker credentials, letting remote attackers gain full read/write access to the broker and control connected devices, exploit requires use of default credentials.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-77056)

## Details

Type

Authentication Bypass

Impact

Broken Authentication

CVSS vector

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/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

Published

26 October 2026

Updated

27 October 2026

Weakness

[CWE-1392](https://cwe.mitre.org/data/definitions/1392.html)

## Vendor fix

Update to version 1.6.0 or later where MQTT passwords are generated per device at first boot.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-77056](https://nvd.nist.gov/vuln/detail/CVE-2026-77056)
- [https://boneio.eu/en/docs/black](https://boneio.eu/en/docs/black)
- [https://cert.pl/en/posts/2026/10/CVE-2026-77052](https://cert.pl/en/posts/2026/10/CVE-2026-77052)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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