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MBS Gateways EUVDEUVD-2026-34078

| CVE-2026-35082 HIGH
Path Traversal (CWE-22)
2026-06-03 CERTVDE GHSA-v475-jf39-hvf2
Path Traversal Single A Double A Profibus Double A X Link Single X Double X Can Double X Dali Double X Knx Double X Lon Double X M Bus Double X Profinet Double X X Link Triple X Knx Dali Triple X Knx Lon Triple X Knx M Bus Triple X Profinet Dali Triple X Profinet Knx Triple X Profinet Lon Triple X Profinet M Bus
8.7
CVSS 4.0 · Vendor: CERTVDE
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Severity by source

Vendor (CERTVDE) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from Vendor (CERTVDE) · only source for this CVE.

CVSS VectorVendor: CERTVDE

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

5
Analysis Updated
Jun 03, 2026 - 13:32 vuln.today
v3 (cvss_changed)
Analysis Updated
Jun 03, 2026 - 13:32 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jun 03, 2026 - 13:22 vuln.today
cvss_changed
CVSS changed
Jun 03, 2026 - 13:22 NVD
8.8 (HIGH) 8.7 (HIGH)
Analysis Generated
Jun 03, 2026 - 12:51 vuln.today

DescriptionCVE.org

The ugw-logread method allows a remote attacker with user privileges to access arbitrary local files due to insufficient validation of user-supplied input.

AnalysisAI

Path traversal in MBS industrial gateway products (Single-A, Double-A, Single-X, Double-X series) allows authenticated remote attackers to read arbitrary files on the device via the ugw-logread method. CVSS 4.0 score of 8.7 reflects network-reachable exploitation with only low-privilege user credentials needed, exposing potentially sensitive configuration, credential, and operational data on industrial protocol gateways. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach gateway management interface
Delivery
Authenticate with low-privilege user account
Exploit
Invoke ugw-logread with traversal path
Execution
Read arbitrary files outside log directory
Persist
Harvest credentials and configuration
Impact
Pivot deeper into OT network
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Vulnerability AssessmentAI

Exploitation Exploitation requires (1) network reachability to the MBS gateway's management interface that exposes the ugw-logread method, and (2) a valid low-privilege user-level credential on the device (CVSS PR:L) - anonymous/unauthenticated access is not indicated. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N) indicates a network-reachable, low-complexity attack requiring only a low-privilege user account and no user interaction, with high impact across confidentiality, integrity, and availability of the vulnerable component, justifying the 8.7 score. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who has obtained or been granted a low-privilege user account on an MBS gateway - for example via reused default credentials, a phished operator login, or an insider - connects to the device over the network and invokes the ugw-logread method with a crafted path argument that escapes the log directory, retrieving files such as configuration backups, stored credentials, certificates, or other sensitive data outside the intended scope. No public exploit identified at time of analysis, but the path-traversal pattern is trivial to weaponize once the request format is known.
Remediation No vendor-released patch identified at time of analysis from the provided input; consult the CERT@VDE advisory at https://www.certvde.com/en/advisories/VDE-2026-039/ for the authoritative fixed firmware versions for each MBS gateway model and apply the vendor-supplied firmware update once available. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Inventory all MBS industrial gateways (Single-A, Double-A, Single-X, Double-X series) in production and audit low-privilege account creation over the past 90 days. …

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EUVD-2026-34078 vulnerability details – vuln.today
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