CVE-2026-44091: Creation of a new configuration by posting a malicious ID to MQTT

Severity: critical (CVSS 9.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-30 · updated 2026-07-31
Weakness: CWE-501

Description

An unauthenticated remote attacker can post a malicious ID to the MQTT Broker results in the creation of a new configuration entry in the system configuration. This may lead to integrity and availability loss.

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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