CVE-2020-13821: Hivemq Broker Control Center

Medium severity, CVSS 5.4. EPSS: 0.5% chance of exploitation in the next 30 days.

An issue was discovered in HiveMQ Broker Control Center 4.3.2. A crafted clientid parameter in an MQTT packet (sent to the Broker) is reflected in the client section of the management console. The attacker's JavaScript is loaded in a browser, which can lead to theft of the session and cookie of the administrator's account of the Broker.

Affected products

• Hivemq Broker Control Center: version 4.3.2 only

Published 2020-08-26. Last modified 2026-06-17.