CVE-2026-44090 PUBLISHED

Missing authentication for MQTT Broker

Assigner: CERTVDE
Reserved: 05.05.2026 Published: 30.07.2026 Updated: 30.07.2026

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.

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS Score: 9.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 9.8

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	Phoenix Contact
Product	CHARX SEC-3150
Versions	Default: unaffected affected from 1.0.0 to 1.9.1 (excl.)

Vendor	Phoenix Contact
Product	CHARX SEC-3100
Versions	Default: unaffected affected from 1.0.0 to 1.9.1 (excl.)

Vendor	Phoenix Contact
Product	CHARX SEC-3050
Versions	Default: unaffected affected from 1.0.0 to 1.9.1 (excl.)

Vendor	Phoenix Contact
Product	CHARX SEC-3000
Versions	Default: unaffected affected from 1.0.0 to 1.9.1 (excl.)

Credits

ZDI finder

References

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

Problem Types

CWE-306 Missing Authentication for Critical Function CWE