Vulnerability · Published Oct 26, 2026 · Assigned by CERT-PL
CVE-2026-77056Use of Default Credentials in boneIO
High 7.1
In plain English
A high-severity security flaw in black_debian_images from boneIO. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| boneIO | black_debian_images | 1.2.0 – before 1.6.0 |
Weakness: CWE-1392 · 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
References
- https://cert.pl/en/posts/2026/10/CVE-2026-77052 third-party-advisory
- https://boneio.eu/en/docs/black product