{"id":"CVE-2020-13821","aliases":["EUVD-2020-6036","GHSA-9qcc-v828-vgx7"],"status":"published","title":"An issue was discovered in HiveMQ Broker Control Center 4.3.2. A crafted clientid parameter in an...","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.","severity":{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00532,"percentile":0.45312,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2020-08-26T15:23:46Z","modified":"2026-06-17T02:53:43Z","products":[{"vendor":"hivemq","product":"broker_control_center"}],"references":[{"url":"https://payatu.com/advisory/hivemq-mqtt-broker---xss-over-mqtt","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://www.hivemq.com/blog/hivemq-4-3-3-released/","tags":["x_refsource_CONFIRM","x_transferred","Release Notes","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-13821"},{"url":"https://www.hivemq.com/downloads/download-hivemq"},{"url":"https://github.com/advisories/GHSA-9qcc-v828-vgx7"}],"sources":{"cve":[{"id":"CVE-2020-13821","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.","status":"published","published":"2020-08-26T15:23:46Z","modified":"2024-08-04T12:25:16.551Z","updated_at":"2026-11-02T14:35:54.170199Z"}],"euvd":[{"id":"EUVD-2020-6036","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.","status":"published","published":"2020-08-26T15:23:46Z","modified":"2024-08-04T12:25:16Z","updated_at":"2026-11-03T03:07:36.182524Z"}],"ghsa":[{"id":"GHSA-9qcc-v828-vgx7","title":"An issue was discovered in HiveMQ Broker Control Center 4.3.2. A crafted clientid parameter in an...","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.","status":"published","published":"2022-05-24T17:26:36Z","modified":"2023-01-29T05:03:52Z","cwes":["CWE-79"],"updated_at":"2026-11-02T14:45:24.688971Z"}],"nvd":[{"id":"CVE-2020-13821","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.","status":"published","published":"2020-08-26T16:15:12.447Z","modified":"2026-06-17T02:53:43.357Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":3.5,"vector":"AV:N/AC:M/Au:S/C:N/I:P/A:N","level":"low","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:06:13.600965Z"}]}}