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MBS Universal Gateway Default Hard-Coded Password Recoverable from Firmware Image Allows Full Unauthenticated Access

Last refreshed2026-10-07

Status: UPDATED  |  Advisory ID: CVE-2026-35075

Key Details

CVECVE-2026-35075
CVSS Score / Version9.8 (Critical) / CVSS v3.1
Updated2026-07-22
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Proseattack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected productssee table below
Classified asCWE-1393 (Use of Default Password)
Exploitation prediction (EPSS)0.59% probability of exploitation in the next 30 days (47% percentile) -- FIRST.org's EPSS model.

Affected Products, Subsystems & Sectors

VendorProductAffected VersionsPatch Status
MBSuniversal_gateway_firmware
MBSSingle-A
MBSDouble-A Profibus
MBSDouble-A x-link
MBSSingle-X
MBSDouble-X CAN
MBSDouble-X DALI
MBSDouble-X KNX
MBSDouble-X LON
MBSDouble-X M-Bus
MBSDouble-X PROFINET
MBSDouble-X x-link
MBSTriple-X KNX+DALI
MBSTriple-X KNX+LON
MBSTriple-X KNX+M-Bus
MBSTriple-X PROFINET+DALI
MBSTriple-X PROFINET+KNX
MBSTriple-X PROFINET+LON
MBSTriple-X PROFINET+M-Bus
SubsystemsGeneral OT
SectorsMultiple

What to Know

An unauthenticated remote attacker can recover a default, hard coded password from a firmware image and thus gain full access to all affected devices.

What to Do

Monitor MBS's web page for any future patch releases. See vendor advisory link below.

References

SourceReference
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-35075
CVEhttps://www.cve.org/CVERecord?id=CVE-2026-35075
Vendor advisoryhttps://www.certvde.com/en/advisories/VDE-2026-039/