CVE-2020-13821

MediumCVSS 5.4/10Last modified Jun 17, 2026

Description

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.

Metrics

CVSS 3.1 5.4/10CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-79

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

https://payatu.com/advisory/hivemq-mqtt-broker---xss-over-mqttThird Party Advisory
https://www.hivemq.com/blog/hivemq-4-3-3-released/Release Notes, Vendor Advisory
https://payatu.com/advisory/hivemq-mqtt-broker---xss-over-mqttThird Party Advisory
https://www.hivemq.com/blog/hivemq-4-3-3-released/Release Notes, Vendor Advisory

Timeline

Published: Aug 26, 2020
Last modified: Jun 17, 2026
NVD status: Modified

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