What’s Vulnerable › Vulnerabilities

CVE-2026-44090: Missing authentication for MQTT Broker

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-30 · updated 2026-07-30
• Weakness: CWE-306

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.

Affected products

• Phoenix Contact CHARX SEC-3000: from 1.0.0 before 1.9.1 — fixed in 1.9.1
• Phoenix Contact CHARX SEC-3050: from 1.0.0 before 1.9.1 — fixed in 1.9.1
• Phoenix Contact CHARX SEC-3100: from 1.0.0 before 1.9.1 — fixed in 1.9.1
• Phoenix Contact CHARX SEC-3150: from 1.0.0 before 1.9.1 — fixed in 1.9.1

How to fix

Upgrade to a fixed version: Phoenix Contact CHARX SEC-3000 1.9.1; Phoenix Contact CHARX SEC-3050 1.9.1; Phoenix Contact CHARX SEC-3100 1.9.1; Phoenix Contact CHARX SEC-3150 1.9.1. Check the vendor advisory for mitigations.

References

• https://www.certvde.com/en/advisories/VDE-2026-008/

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