CVE-2026-21660 Johnson Controls-Frick Quantum HD-Hardcoded Email Credentials Saved as Plaintext in Firmware

Medium 6.9 Published 27 Feb 2026 Updated 24 Aug 2026

Hardcoded plaintext email credentials in Frick Controls Quantum HD firmware allow unauthorized access and potential system compromise.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-21660?

CVE-2026-21660 is a medium-severity vulnerability in Johnson Controls Frick Controls Quantum HD, published on 27 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A Hardcoded Email Credentials Saved as Plaintext in Firmware (CWE-256: Plaintext Storage of a Password) vulnerability in Frick Controls Quantum HD version 10.22 and prior lead to unauthorized access, exposure of sensitive information, and potential misuse or system compromise

This issue affects Frick Controls Quantum HD version 10.22 and prior.

Weakness: CWE-522, CWE-256

Which versions are affected by CVE-2026-21660?

It affects 1 product.

Products include Johnsoncontrols Frick Controls Quantum Hd Firmware.

How do I fix CVE-2026-21660?

No fix has been published for CVE-2026-21660 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-21660 being exploited?

There is no known exploitation of CVE-2026-21660 in the wild and no public exploit code.

Sources

Also known as GHSA-2f5g-m75x-xphf.