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CVE-2026-126495

MQTTX through 1.13.3 Stored XSS via Topic Tree and JSON Tree Tooltips

MQTTX desktop through 1.13.3 contains a stored cross-site scripting vulnerability that allows attackers to inject script by publishing malicious MQTT topic names or payloads rendered unescaped in tooltips. Attackers controlling a broker or publishing to subscribed topics can execute script in the Electron renderer, which has nodeIntegration enabled, when victims hover Topic Tree or JSON tree nodes.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Emqx
Products
Mqttx
CVE-2025-62413

MQTTX vulnerable to cross-site scripting via improper message payload rendering

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.

CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed
Vendors
Emqx
Products
Mqttx