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CVE-2026-35075— Hardcoded default Password for Service Account

Quick assessment

Affected
MBS Single-A
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MBS Single-A等都是德国MBS公司的一系列工业通信网关。 MBS多款产品存在安全漏洞，该漏洞源于从固件镜像中可恢复默认硬编码密码，可能导致未经身份验证的远程攻击者获得完全访问权限。以下产品受到影响：Single-A、Double-A Profibus、Double-A x-link和Single-X。

CVSS 9.8 · Critical EPSS 0.59% · P46

Affected Version Matrix 18

VendorProduct Version RangeStatus
MBS Double-A Profibus V1_00_00< V6_00_07 affected
MBS Double-A x-link V1_00_00< V6_00_07 affected
MBS Double-X CAN V1_00_00< V6_00_07 affected
MBS Double-X DALI V1_00_00< V6_00_07 affected
MBS Double-X KNX V1_00_00< V6_00_07 affected
MBS Double-X LON V1_00_00< V6_00_07 affected
MBS Double-X M-Bus V1_00_00< V6_00_07 affected
MBS Double-X PROFINET V1_00_00< V6_00_07 affected
MBS Double-X x-link V1_00_00< V6_00_07 affected
MBS Single-A V1_00_00< V6_00_07 affected
MBS Single-X V1_00_00< V6_00_07 affected
MBS Triple-X KNX+DALI V1_00_00< V6_00_07 affected
MBS Triple-X KNX+LON V1_00_00< V6_00_07 affected
MBS Triple-X KNX+M-Bus V1_00_00< V6_00_07 affected
MBS Triple-X PROFINET+DALI V1_00_00< V6_00_07 affected
MBS Triple-X PROFINET+KNX V1_00_00< V6_00_07 affected
MBS Triple-X PROFINET+LON V1_00_00< V6_00_07 affected
MBS Triple-X PROFINET+M-Bus V1_00_00< V6_00_07 affected
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I. Basic Information for CVE-2026-35075

Vulnerability Information
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Vulnerability Title
Hardcoded default Password for Service Account
Source: CVE Program / CVE List V5
Vulnerability Description
An unauthenticated remote attacker can recover a default, hard coded password from a firmware image and thus gain full access to all affected devices.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1393
Source: CVE Program / CVE List V5
Vulnerability Title
MBS多款产品 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MBS Single-A等都是德国MBS公司的一系列工业通信网关。 MBS多款产品存在安全漏洞，该漏洞源于从固件镜像中可恢复默认硬编码密码，可能导致未经身份验证的远程攻击者获得完全访问权限。以下产品受到影响：Single-A、Double-A Profibus、Double-A x-link和Single-X。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
MBS Single-A V1_00_00 ~ V6_00_07 -
MBS Double-A Profibus V1_00_00 ~ V6_00_07 -
MBS Double-A x-link V1_00_00 ~ V6_00_07 -
MBS Single-X V1_00_00 ~ V6_00_07 -
MBS Double-X CAN V1_00_00 ~ V6_00_07 -
MBS Double-X DALI V1_00_00 ~ V6_00_07 -
MBS Double-X KNX V1_00_00 ~ V6_00_07 -
MBS Double-X LON V1_00_00 ~ V6_00_07 -
MBS Double-X M-Bus V1_00_00 ~ V6_00_07 -
MBS Double-X PROFINET V1_00_00 ~ V6_00_07 -
MBS Double-X x-link V1_00_00 ~ V6_00_07 -
MBS Triple-X KNX+DALI V1_00_00 ~ V6_00_07 -
MBS Triple-X KNX+LON V1_00_00 ~ V6_00_07 -
MBS Triple-X KNX+M-Bus V1_00_00 ~ V6_00_07 -
MBS Triple-X PROFINET+DALI V1_00_00 ~ V6_00_07 -
MBS Triple-X PROFINET+KNX V1_00_00 ~ V6_00_07 -
MBS Triple-X PROFINET+LON V1_00_00 ~ V6_00_07 -
MBS Triple-X PROFINET+M-Bus V1_00_00 ~ V6_00_07 -

II. Public POCs for CVE-2026-35075

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III. Intelligence Information for CVE-2026-35075

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Vendor Advisories for CVE-2026-35075 (1)

Same Patch Batch · MBS · 2026-06-03 · 11 CVEs total

CVE-2026-35085 8.8 HIGH Stack buffer overflow in method gdv-serverconfig
CVE-2026-35084 8.8 HIGH Stack buffer overflow in method dali-devconfig
CVE-2026-35083 8.8 HIGH Stack buffer overflow in method bac-deviceobject
CVE-2026-35082 8.8 HIGH Local file inclusion vulnerability and deletion in ugw-logread method
CVE-2026-35081 8.1 HIGH Arbitrary process termination vulnerability in method ugw-logstop
CVE-2026-35079 8.1 HIGH Arbitrary file delete vulnerability in method ugw-restore
CVE-2026-35078 8.1 HIGH Arbitrary file delete vulnerability in method ugw-logstop
CVE-2026-35080 8.1 HIGH Arbitrary file delete vulnerability in method ugw-restoreinfo
CVE-2026-35077 8.1 HIGH Arbitrary file delete vulnerability in method ugw-delete-file
CVE-2026-35076 8.1 HIGH Arbitrary file delete vulnerability in method bac-scanresult

IV. Related Vulnerabilities

Same product: Single-A
Same vendor: MBS
Same weakness: CWE-1393

V. Comments for CVE-2026-35075

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