CVE-2026-49198
MediumCVSS 4.9Exploitation Probability (EPSS)
Low risk11th percentile - higher than 11% of all known CVEs
Summary
Improper access control in the MQTT broker allows wildcard topic subscriptions, exposing all MQTT traffic to unauthorized actors.
Risk Assessment
The organization risks exposure of all MQTT traffic, including sensitive data from IoT devices and industrial systems.
Recommendation
Update the MQTT broker configuration to disable or restrict wildcard subscriptions for unauthorized users.
Other vulnerabilities in MQTT Broker
See all- CVE-2026-44091Critical
An unauthenticated remote attacker can post a malicious ID to the MQTT Broker, resulting in the creation of a new configuration entry in the system configuration. This may lead to integrity and availability loss.
- CVE-2026-44090Critical
Missing authentication in the MQTT broker allows an unauthenticated remote attacker to access the broker, which is only protected from external access by a firewall. This may lead to full compromise of the device.
- CVE-2026-49186Critical
The local MQTT broker does not enforce topic-level Access Control Lists (ACLs). Any client can subscribe using wildcard characters (# or +) to enumerate hidden network devices or publish rogue control commands.
Original NVD description (English source)
Improper access control in the MQTT broker allows wildcard topic subscriptions, exposing all MQTT traffic to unauthorized actors.