Is CVE-2026-75167 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-75167 being exploited in the wild.

How severe is CVE-2026-75167?

Medium severity, with a CVSS score of 4.3, published 4 September 2026.

Which products and versions are affected?

MBS X-Serie Gateway V6_00_05 and earlier.

Is there a fix for CVE-2026-75167?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-75167 attacked?

It is attacked over the network, in device firmware.

Am I affected by CVE-2026-75167?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-75167: MBS X-Serie Gateway broken access control in user edit method

CVE-2026-75167 · Severity: medium · CVSS 4.3 · Published 2026-09-04

The MBS X-Serie Gateway is a universal industrial gateway used in building automation and critical infrastructure to translate between different communication protocols (KNX, PROFIBUS, DALI, etc.). A vulnerability in the user management feature allows an authenticated attacker with a low-level "Standard" user account to reset passwords for any other user, potentially including administrative accounts, leading to unauthorized access and system compromise.

Quick answers

Is CVE-2026-75167 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-75167 being exploited in the wild.
How severe is CVE-2026-75167?: Medium severity, with a CVSS score of 4.3, published 4 September 2026.
Which products and versions are affected?: MBS X-Serie Gateway V6_00_05 and earlier.
Is there a fix for CVE-2026-75167?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-75167 attacked?: It is attacked over the network, in device firmware.
Am I affected by CVE-2026-75167?: Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

This is a broken access control vulnerability in the ugw-usr-edit method of the /cgi-bin/wwwugw.cgi CGI script. The flaw fails to properly validate that a Standard-role user can only modify their own account; instead, it allows changing the password of arbitrary accounts. The vulnerability is accessible to any authenticated user via HTTP/HTTPS on the built-in web server. An attacker with valid Standard credentials can exploit this to escalate privileges by taking over higher-privileged accounts (such as administrative accounts), gaining full control of the gateway device and its automation functions. Firmware version V6_00_05 and earlier are affected.

Affected products

MBS X-Serie Gateway V6_00_05 and earlier

Timeline

2026-09-04: disclosed

References

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