CVE-2026-21659 Path traversal in Frick Controls Quantum HD

High 8.7 Published 27 Feb 2026 Updated 6 Mar 2026

Unauthenticated attackers can execute arbitrary code and read sensitive data via Local File Inclusion in Johnson Controls Frick Quantum HD devices.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-21659?

CVE-2026-21659 is a high-severity path traversal vulnerability in Johnson Controls Frick Controls Quantum HD, published on 27 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Unauthenticated Remote Code Execution and Information Disclosure due to Local File Inclusion (LFI) vulnerability in Johnson Controls Frick Controls Quantum HD allow an unauthenticated attacker to execute arbitrary code on the affected device, leading to full system compromise. This issue affects Frick Controls Quantum HD: Frick Controls Quantum HD version 10.22 and prior.

Weakness: CWE-22, CWE-23

Which versions are affected by CVE-2026-21659?

It affects 1 product.

Products include Johnsoncontrols Frick Controls Quantum Hd Firmware.

How do I fix CVE-2026-21659?

No fix has been published for CVE-2026-21659 yet. Limit exposure of the affected software until one is available.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2026-21659 being exploited?

There is no known exploitation of CVE-2026-21659 in the wild and no public exploit code.

Sources

Also known as GHSA-7qxc-43wm-v793.