MQTTX is an MQTT 5.0 desktop client and MQTT testing tool. A Cross-Site Scripting (XSS) vulnerability was introduced in MQTTX v1.12.0 due to improper handling of MQTT message payload rendering. Malicious payloads containing HTML or JavaScript could be rendered directly in the MQTTX message viewer. If exploited, this could allow attackers to execute arbitrary scripts in the context of the application UI — for example, attempting to access MQTT connection credentials or trigger unintended actions through script injection. This vulnerability is especially relevant when MQTTX is used with brokers in untrusted or multi-tenant environments, where message content cannot be fully controlled. This vulnerability is fixed in 1.12.1.
                
            Metrics
Affected Vendors & Products
References
        History
                    Mon, 20 Oct 2025 13:30:00 +0000
| Type | Values Removed | Values Added | 
|---|---|---|
| First Time appeared | Emqx Emqx mqttx | |
| Vendors & Products | Emqx Emqx mqttx | 
Thu, 16 Oct 2025 19:15:00 +0000
| Type | Values Removed | Values Added | 
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| Metrics | ssvc 
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Thu, 16 Oct 2025 18:15:00 +0000
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| Description | MQTTX is an MQTT 5.0 desktop client and MQTT testing tool. A Cross-Site Scripting (XSS) vulnerability was introduced in MQTTX v1.12.0 due to improper handling of MQTT message payload rendering. Malicious payloads containing HTML or JavaScript could be rendered directly in the MQTTX message viewer. If exploited, this could allow attackers to execute arbitrary scripts in the context of the application UI — for example, attempting to access MQTT connection credentials or trigger unintended actions through script injection. This vulnerability is especially relevant when MQTTX is used with brokers in untrusted or multi-tenant environments, where message content cannot be fully controlled. This vulnerability is fixed in 1.12.1. | |
| Title | MQTTX vulnerable to cross-site scripting via improper message payload rendering | |
| Weaknesses | CWE-79 | |
| References |  | |
| Metrics | cvssV3_1 
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 MITRE
                        MITRE
                    Status: PUBLISHED
Assigner: GitHub_M
Published: 2025-10-16T18:00:17.606Z
Updated: 2025-10-16T18:36:21.402Z
Reserved: 2025-10-13T16:26:12.179Z
Link: CVE-2025-62413
 Vulnrichment
                        Vulnrichment
                    Updated: 2025-10-16T18:36:18.363Z
 NVD
                        NVD
                    Status : Awaiting Analysis
Published: 2025-10-16T18:15:40.080
Modified: 2025-10-21T19:31:50.020
Link: CVE-2025-62413
 Redhat
                        Redhat
                    No data.