CVE-2026-126495
MQTTX through 1.13.3 Stored XSS via Topic Tree and JSON Tree Tooltips
CVSS Score
6.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-79 |
| Vendor | emqx |
| Product | mqttx |
| Published | Nov 11, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
emqx / MQTTX
0 ≤ 1.13.3
References
github.com: https://github.com/emqx/MQTTX/issues/2180 github.com: https://github.com/emqx/MQTTX/blob/v1.13.3/src/widgets/TreeView.vue#L195-L226 github.com: https://github.com/emqx/MQTTX/blob/v1.13.3/src/widgets/JSONViewer.vue#L175-L184 github.com: https://github.com/emqx/MQTTX/blob/v1.13.3/src/background.ts#L276-L283 github.com: https://github.com/emqx/MQTTX vulncheck.com: https://www.vulncheck.com/advisories/mqttx-through-1.13.3-stored-xss-via-topic-tree-and-json-tree-tooltips
Credits
ikram-4