F&F Filipowski mH-DEVELOPER up to 3.0.29 SSH Configuration authorized_keys backdoor

Summaryinfo

A vulnerability was found in F&F Filipowski mH-DEVELOPER up to 3.0.29. It has been declared as very critical. This impacts an unknown function of the file /root/.ssh/authorized_keys of the component SSH Configuration. Executing a manipulation can lead to backdoor. This vulnerability is handled as CVE-2026-82928. The attack can be executed remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in F&F Filipowski mH-DEVELOPER up to 3.0.29. It has been declared as very critical. This vulnerability affects some unknown processing of the file /root/.ssh/authorized_keys of the component SSH Configuration. The manipulation with an unknown input leads to a backdoor vulnerability. The CWE definition for the vulnerability is CWE-912. The product contains functionality that is not documented, not part of the specification, and not accessible through an interface or command sequence that is obvious to the product's users or administrators. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

mH-DEVELOPER smart home module contains a hardcoded SSH public key in /root/.ssh/authorized_keys, serving as a potential backdoor. The SSH daemon allows root login via key authentication and starts automatically. An attacker with the matching private key can gain a root shell on any affected device, resulting in full system compromise. The key cannot be removed without remounting the file system and survives a factory reset. Vendor notes that this functionality was used only for service purposes. This issue was fixed in version 3.0.30

The advisory is available at cert.pl. This vulnerability was named CVE-2026-82928 since 08/31/2026. The exploitation appears to be easy. The attack can be initiated remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/28/2026). This vulnerability is assigned to T1588.001 by the MITRE ATT&CK project.

Upgrading to version 3.0.30 eliminates this vulnerability.

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Productinfo

Vendor

• F&F Filipowski

Name

• mH-DEVELOPER

Version

• 3.0.0
• 3.0.1
• 3.0.2
• 3.0.3
• 3.0.4
• 3.0.5
• 3.0.6
• 3.0.7
• 3.0.8
• 3.0.9
• 3.0.10
• 3.0.11
• 3.0.12
• 3.0.13
• 3.0.14
• 3.0.15
• 3.0.16
• 3.0.17
• 3.0.18
• 3.0.19
• 3.0.20
• 3.0.21
• 3.0.22
• 3.0.23
• 3.0.24
• 3.0.25
• 3.0.26
• 3.0.27
• 3.0.28
• 3.0.29

CPE 2.3info

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CPE 2.2info

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