Title: eNet SMART HOME server 2.3.1 (deleteUserAccount) Arbitrary User Deletion
Advisory ID: ZSL-2026-5973
Type: Local/Remote
Impact: Denial of Service, Privilege Escalation, Security Bypass
Risk: (4/5)
Release Date: 14.02.2026

Summary

Two German specialists in building systems technology are jointly bringing a new, wireless-based smart home system to the market. Gira and JUNG are the companies behind the eNet SMART HOME brand with our subsidiary, INSTA, responsible for developing the system. All three of us are old hands when it comes to building automation, and have a history of connecting buildings in an intelligent way that goes back as far as the 80s. Gira, JUNG and INSTA were part of the group of companies that initiated and founded EIBA (now known as KNX). KNX is the first open global standard for home and building automation. Through KNX, we have decisively shaped the development of intelligent building systems technology – and this wealth of experience has now come together in eNet SMART HOME. The eNet server is the heart of every eNet SMART HOME system and offers end customers the basis for an easy-to-use and secure Smart Home and installation engineers easily understandable and professional commissioning of the system.

Description

The eNet Smart Home system contains an authorization weakness in the deleteUserAccount JSON-RPC method that permits any authenticated low-privileged user (UG_USER) to delete arbitrary user accounts, except for the built-in admin account. The application does not enforce proper role-based access control on this function, allowing a standard user to submit a crafted request specifying another username and have that account removed without elevated permissions or additional confirmation. This enables unauthorized user management actions, leading to denial of service against legitimate users, disruption of operations, and potential concealment of malicious activity.

Vendor

Gira Giersiepen GmbH & Co. KG | ALBRECHT JUNG GmbH & Co. KG | Insta GmbH - https://www.enet-smarthome.com

Affected Version

2.3.1 (46841)
2.2.1 (46056)

Tested On

GNU/Linux 4.4.15 (ARMv7 revision 5)
Jetty(9.2.z-SNAPSHOT)

Vendor Status

[07.02.2026] Vulnerability discovered.
[07.02.2026] Vendor contacted.
[13.02.2026] No response from the vendor.
[14.02.2026] Public security advisory released.

PoC

enet_usrdel.txt

Credits

Vulnerability discovered by Gjoko Krstic - <[email protected]>

References

[1] https://www.zeroscience.mk/en/vulnerabilities/ZSL-2026-5975.php

Changelog

[14.02.2026] - Initial release

Contact

Zero Science Lab

Web: https://www.zeroscience.mk
e-mail: [email protected]