Executive Summary

CVE-2026-10521 is a vulnerability found in mbCONNECT24 and mymbCONNECT24 devices by MB connect line GmbH. An authenticated remote attacker with high privileges can exploit this flaw to access a hidden configuration method that should not be accessible to any user.

This hidden method allows the attacker to modify critical program parameters, which can compromise the affected system's security.

Useful 0 Not Useful 0

Impact Analysis

Exploiting this vulnerability can lead to a total loss of confidentiality, integrity, and availability of the affected systems.

• Confidentiality loss means sensitive data could be exposed.
• Integrity loss means critical program parameters can be altered, potentially causing malfunction or unauthorized behavior.
• Availability loss means the system or services could be disrupted or rendered unusable.

Useful 0 Not Useful 0

Mitigation Strategies

To mitigate the risk of CVE-2026-10521, users should update their mbCONNECT24 and mymbCONNECT24 devices to firmware version 2.20.2 or later.

This update addresses the vulnerability that allows an authenticated remote attacker to access a hidden configuration method and modify critical program parameters.

Useful 0 Not Useful 0

Compliance Impact

This vulnerability allows a high privileged remote attacker to access hidden configuration methods and modify critical program parameters, resulting in a total loss of confidentiality, integrity, and availability.

Such a total loss of confidentiality, integrity, and availability can negatively impact compliance with common standards and regulations like GDPR and HIPAA, which require protection of sensitive data and system integrity.

However, the provided information does not explicitly mention the impact on specific compliance requirements or regulatory frameworks.

Useful 0 Not Useful 0

Detection Guidance

This vulnerability involves unauthorized access to a hidden configuration method in mbCONNECT24 and mymbCONNECT24 devices. Detection typically involves verifying the firmware version and monitoring for unauthorized access attempts to restricted configuration endpoints.

To detect if your system is vulnerable, first check the firmware version of your mbCONNECT24 or mymbCONNECT24 device. Versions 2.20.1 and below 2.20.2 are affected. Ensure your firmware is updated to 2.20.2 or later.

• Check firmware version via device management interface or command line.
• Monitor network traffic for suspicious HTTP requests targeting hidden configuration endpoints that should not be accessible.
• Use network scanning tools to identify devices running vulnerable firmware versions.

Specific commands depend on your environment and device access methods. For example, if SSH or CLI access is available, you might run commands to query firmware versions or check logs for unauthorized access attempts. Unfortunately, no explicit commands are provided in the available resources.

Useful 0 Not Useful 0