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MBS Universal Gateway CVE-2026-35078

| EUVDEUVD-2026-34074 HIGH
External Control of File Name or Path (CWE-73)
2026-06-03 CERTVDE GHSA-2jpx-w8gq-pj3x
Information Disclosure 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
7.2
CVSS 4.0 · Vendor: CERTVDE
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Severity by source

Vendor (CERTVDE) PRIMARY
7.2 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/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:N/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 - 13:36 vuln.today
v3 (cvss_changed)
Analysis Updated
Jun 03, 2026 - 13:36 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
8.1 (HIGH) 7.2 (HIGH)
Analysis Generated
Jun 03, 2026 - 12:52 vuln.today

DescriptionCVE.org

The ugw-logstop method allows a remote attacker with user privileges to delete arbitrary local files due to insufficient validation of user-controlled input.

AnalysisAI

Arbitrary file deletion in MBS Universal Gateway (UGW) product line allows authenticated remote attackers to delete local files on the device via the ugw-logstop method, which fails to validate user-supplied path input. The flaw affects MBS Single-A, Double-A (Profibus, X-link), Single-X, and Double-X (CAN, DALI, KNX, LON, M-Bus, Profinet) industrial protocol gateways. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain low-privilege gateway credentials
Delivery
Reach UGW management interface over network
Exploit
Invoke ugw-logstop with path-traversal filename
Execution
Gateway deletes targeted file without validation
Persist
Critical config or binary removed
Impact
Gateway service fails, OT protocol bridging disrupted
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Vulnerability AssessmentAI

Exploitation Attacker must possess valid low-privilege user credentials on the MBS UGW device (CVSS PR:L) and have network reachability to the gateway's management service that exposes the ugw-logstop method. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 4.0 vector (AV:N/AC:L/PR:L/UI:N, VI:H/VA:H) indicates a network-reachable, low-complexity attack requiring only basic authenticated user privileges with no user interaction and high impact on integrity and availability - but no confidentiality impact, consistent with file deletion rather than data exfiltration. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who has obtained low-privilege user credentials on an MBS UGW gateway - for example via a phished engineering workstation, a default/weak password, or lateral movement within an OT network - connects to the device's management interface over the network and invokes the ugw-logstop method with a crafted path argument (e.g., a traversal sequence pointing to a critical configuration file, certificate, or runtime binary). The deletion of that file disrupts gateway operation, potentially halting fieldbus protocol translation between the corporate/SCADA layer and Profibus/Profinet/KNX/etc. …
Remediation Patch status from available data is unclear: no fix version is enumerated in the provided intelligence, so consult the CERT@VDE advisory at https://www.certvde.com/en/advisories/VDE-2026-039/ for the vendor-released patched firmware version for each affected MBS gateway model and apply it as the primary remediation. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: inventory all MBS UGW devices in production, document firmware versions and model variants, and review administrative access logs for suspicious file deletion activity. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-35078 vulnerability details – vuln.today
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