CVE-2026-40852: MB connect line mbNET OS command injection in config generator

CVE-2026-40852 · Severity: high · CVSS 7.2 · Published 2026-05-27

MB connect line industrial routers are used to provide secure remote access to industrial control systems. A vulnerability in the configuration management system allows an administrator-level attacker to inject malicious code into the device's settings. If exploited, this allows the attacker to take full control of the router, potentially disrupting industrial operations or accessing sensitive internal network traffic.

Vendors: MB connect line.

Quick answers

Is CVE-2026-40852 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-40852 being exploited in the wild.
How severe is CVE-2026-40852?
High severity, with a CVSS score of 7.2, published 27 May 2026.
Which products and versions are affected?
MB connect line mbNET <= 3.0.2; MB connect line mbNET.mini <= 3.0.2; MB connect line mbNET.rokey <= 8.4.4.
Is there a fix for CVE-2026-40852?
A patch was published on 2026-05-27: Fixed in mbNET/mbNET.rokey 8.4.5 and mbNET.mini 3.0.3 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-40852 attacked?
It is attacked over the network, in an operating system.
Am I affected by CVE-2026-40852?
Check whether you run MB connect line mbNET, MB connect line mbNET.mini or MB connect line mbNET.rokey 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 OS command injection vulnerability (CWE-78) exists in the configuration generator of MB connect line mbNET, mbNET.rokey, and mbNET.mini devices. A highly authenticated attacker can modify configuration parameters that are subsequently passed to a system execution call without adequate validation. This allows for the injection of arbitrary payloads into future generated configurations, resulting in remote code execution with high privileges. The attack is reachable over the network but requires high-level administrative credentials. Patches are available in firmware versions 8.4.5 for mbNET/mbNET.rokey and 3.0.3 for mbNET.mini.

Affected products

  • MB connect line mbNET.mini <= 3.0.2
  • MB connect line mbNET <= 8.4.4
  • MB connect line mbNET.rokey <= 8.4.4

Timeline

  • 2026-05-27: disclosed
  • 2026-05-27: advisory
  • 2026-05-27: patched: Fixed in mbNET/mbNET.rokey 8.4.5 and mbNET.mini 3.0.3

References

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