CVE-2026-77060

Incorrect Permission Assignment for Critical Resource in boneIO

Published Oct 26, 2026 CVSS 4.0 · 6.8 Medium EPSS < 1% KEV · Not listed

Description

boneIO black_debian_images stores the Mosquitto MQTT broker password file at /etc/mosquitto/passwd with world-readable permissions. Any local user can read the password hashes for all MQTT accounts and perform offline dictionary attacks.

This issue was fixed in version 1.6.0.

Analysis

Technical impact

boneIO black_debian_images containers store the Mosquitto MQTT broker password file at /etc/mosquitto/passwd with world-readable permissions. This permits any local user to read the password hashes for all MQTT accounts, enabling offline dictionary attacks to recover clear-text passwords and gain unauthorized access to the MQTT network.

Affected Systems

Vulnerable images are boneIO black_debian_images, versions older than 1.6.0. The issue has been fixed in version 1.6.0, which removes the world-readable permission on the password file. Containers built before 1.6.0 or running older images are at risk.

Risk and Exploitability

The CVSS score of 6.8 indicates moderate severity. The attack vector is local; any user with access to the container or host can read the file. EPSS is not available and the vulnerability is not listed in the CISA KEV catalog, suggesting limited widespread exploitation, but the potential to acquire MQTT credentials remains a critical concern.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

boneIO

black_debian_images

unaffected

Version	Status	Constraints
`1.2.0`	affected	< 1.6.0

No data.

Vendor Product Versions

Boneio

Black Debian Images

Version	Status	Scheme	Platform
`[1.2.0,1.6.0)`	affected	semver	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Upgrade to boneIO black_debian_images version 1.6.0 or newer to eliminate the world‑readable permission on the /etc/mosquitto/passwd file.
After upgrading, ensure that the file resides with secure permissions (e.g., 640) and is owned by the mosquitto user.
If an upgrade cannot be performed immediately, restrict local user access to the container runtime or host, or temporarily change the file permissions to 600 to block read access by other users.

Generated by OpenCVE AI on October 26, 2026 at 16:42 UTC.

Tracking

Advisories

No advisories available

Metrics

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.126% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

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

History

Oct 26, 2026 4:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Oct 26, 2026 3:00 PM Description updated. Title updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		boneIO black_debian_images stores the Mosquitto MQTT broker password file at /etc/mosquitto/passwd with world-readable permissions. Any local user can read the password hashes for all MQTT accounts and perform offline dictionary attacks. This issue was fixed in version 1.6.0.
Title		Incorrect Permission Assignment for Critical Resource in boneIO
First Time appeared		Boneio Boneio black Debian Images
Weaknesses		CWE-732
CPEs		cpe:2.3:a:boneio:black_debian_images::::::::
Vendors & Products		Boneio Boneio black Debian Images
References		https://boneio.eu/en/docs/black https://cert.pl/en/posts/2026/10/CVE-2026-77052
Metrics		cvssV4_0 `{'score': 6.8, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}`