CVE-2026-22535 FRAIL SECURITY IN MQTT PROTOCOL ALLOWS AN ATTACKER MODIFY CRITICAL PARAMETERS
An attacker with network access and credentials can modify critical parameters on EFACEC QC series devices due to unsecured MQTT communications.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-22535?
CVE-2026-22535 is a high-severity missing authorization vulnerability in EFACEC QC 60/90/120, published on 7 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An attacker with the ability to interact through the network and with access credentials, could, thanks to the unsecured (unencrypted) MQTT communications protocol, write on the server topics of the board that controls the MQTT communications
Weakness: CWE-1366
Which versions are affected by CVE-2026-22535?
How do I fix CVE-2026-22535?
No fix has been published for CVE-2026-22535 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-22535 being exploited?
There is no known exploitation of CVE-2026-22535 in the wild and no public exploit code.
Sources
Also known as GHSA-jj3f-4mq7-82wx.