CVE-2026-44090 Missing authentication for MQTT Broker
Unauthenticated attackers can access the MQTT broker to fully compromise the device, requiring immediate patching for Phoenix Contact CHARX SEC 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-2026-44090?
CVE-2026-44090 is a critical authentication bypass vulnerability in Phoenix Contact CHARX SEC-3000, published on 30 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Due to missing authentication, an unauthenticated remote attacker may access the MQTT broker, which is only protected from external access by a firewall. This may lead to the device being fully compromised.
Weakness: CWE-306
Which versions are affected by CVE-2026-44090?
How do I fix CVE-2026-44090?
No fix has been published for CVE-2026-44090 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-44090 being exploited?
There is no known exploitation of CVE-2026-44090 in the wild and no public exploit code.
Sources
Also known as GHSA-9h9r-3q9w-h7vj.