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MBS Universal Gateway CVE-2026-35080

| EUVDEUVD-2026-34076 HIGH
External Control of File Name or Path (CWE-73)
2026-06-03 CERTVDE GHSA-vhmf-2j3g-8p9g
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 - 13:35 vuln.today
v3 (cvss_changed)
Analysis Updated
Jun 03, 2026 - 13:34 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 - 12:51 vuln.today

DescriptionCVE.org

The ugw-restoreinfo 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 GmbH universal gateway (UGW) products allows authenticated remote users to remove files on the device through the ugw-restoreinfo method, which fails to validate user-controlled path input (CWE-73). The flaw, reported by CERT@VDE and tracked under VDE-2026-039, affects the Single-A, Double-A (Profibus/X-Link), Single-X, and Double-X (CAN/DALI/KNX/LON/M-Bus/Profinet) fieldbus gateway product lines used in industrial and building automation. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach gateway management interface over network
Delivery
Authenticate with low-privilege user credentials
Exploit
Invoke ugw-restoreinfo with traversal path
Execution
Bypass insufficient path validation
Persist
Delete targeted configuration or runtime file
Impact
Gateway loses fieldbus availability or integrity
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Vulnerability AssessmentAI

Exploitation The attacker must have network reachability to the gateway's management interface and must be authenticated with at least a low-privileged user account on the device (CVSS PR:L); no administrator role, no user interaction, and no special client configuration are required. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 4.0 base score is 7.2 with vector AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N - network-reachable, low complexity, only a low-privileged authenticated user is required, no user interaction, and high impact to integrity and availability of the vulnerable component (no confidentiality impact, no scope change). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who has obtained or been issued a low-privilege user account on an MBS UGW gateway - for example a maintenance contractor account or credentials harvested from another OT host - sends a crafted request to the ugw-restoreinfo method with a path parameter pointing outside the restore directory. The handler deletes the referenced file, which could be a configuration database, certificate store, or runtime artifact, causing the gateway to fail safe-state, lose protocol bindings, or refuse to restart and disrupting the connected fieldbus segment. …
Remediation No vendor-released patch version is identified in the available data; consult the CERT@VDE advisory at https://www.certvde.com/en/advisories/VDE-2026-039/ and the MBS GmbH support channel for the fixed firmware build for each affected gateway line. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Inventory all MBS UGW deployments (Single-A, Double-A, Single-X, Double-X product lines) and document their operational role and network location. …

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

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CVE-2026-35080 vulnerability details – vuln.today
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