# CVE-2026-35078: MBS Universal Gateway arbitrary file deletion in ugw-logstop

Source: https://junglewise.ai/threats/cve-2026-35078-mbs-universal-gateway-arbitrary-file-deletion-in-ugw-logstop  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-03. Updated: 2026-06-03  
License: CC BY 4.0 with a link back

CVE-2026-35078 · Severity: high · CVSS 8.1 · Published 2026-06-03

MBS Universal Gateways are devices used to connect different communication protocols in building automation systems. A security vulnerability in the web management interface allows an authenticated user to delete important system files. This could lead to a complete loss of device configuration or cause the gateway to stop functioning, disrupting building operations.

Technologies: [MBS GmbH Universal Gateway A-Series Firmware](https://junglewise.ai/threats/technologies/universal-gateway-a-series-firmware), [MBS GmbH Universal Gateway X-Series Firmware](https://junglewise.ai/threats/technologies/universal-gateway-x-series-firmware). Vendors: [MBS GmbH](https://junglewise.ai/threats/vendors/mbs-gmbh).

## Quick answers

**Is CVE-2026-35078 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-35078 being exploited in the wild.

**How severe is CVE-2026-35078?** High severity, with a CVSS score of 8.1, published 3 June 2026.

**Which products and versions are affected?** MBS GmbH Universal Gateway A-Series Firmware < V6_0_0_7; MBS GmbH Universal Gateway X-Series Firmware < V6_0_0_7.

**Is there a fix for CVE-2026-35078?** A patch was published on 2026-06-03: Fixed in firmware version V6_0_0_7 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-35078 attacked?** It is attacked over the network, in device firmware.

**Am I affected by CVE-2026-35078?** Check whether you run MBS GmbH Universal Gateway A-Series Firmware or MBS GmbH Universal Gateway X-Series Firmware at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An arbitrary file deletion vulnerability (CWE-73) exists in the ugw-logstop CGI method of MBS Universal Gateway (UGW) A-Series and X-Series firmware. The flaw stems from insufficient validation of user-supplied input, allowing a remote attacker with low-level user privileges to specify and delete arbitrary local files on the filesystem. This is achieved via network requests to the web GUI's underlying CGI endpoints. Successful exploitation can lead to denial of service or loss of critical configuration data. The vulnerability is addressed in firmware version V6_0_0_7.

## Affected products

- MBS GmbH Universal Gateway A-Series Firmware < V6_0_0_7
- MBS GmbH Universal Gateway X-Series Firmware < V6_0_0_7

## Timeline

- 2026-06-03: disclosed
- 2026-06-03: advisory
- 2026-06-03: patched: Fixed in firmware version V6_0_0_7

## References

- [https://www.certvde.com/en/advisories/VDE-2026-039/](https://www.certvde.com/en/advisories/VDE-2026-039/)

## Related threats

- [MBS Universal Gateway path traversal in ugw-logread](https://junglewise.ai/threats/cve-2026-35082-mbs-universal-gateway-path-traversal-in-ugw-logread)
- [MBS Universal Gateway arbitrary process termination in ugw-logstop](https://junglewise.ai/threats/cve-2026-35081-mbs-universal-gateway-arbitrary-process-termination-in-ugw)
- [MBS Universal Gateway arbitrary file deletion in bac-scanresult](https://junglewise.ai/threats/cve-2026-35076-mbs-universal-gateway-arbitrary-file-deletion-in-bac-scanresult)
- [MBS Universal Gateway hardcoded password in firmware](https://junglewise.ai/threats/cve-2026-35075-mbs-universal-gateway-hardcoded-password-in-firmware)