Bug 2571410 (CVE-2026-126495)

Summary: CVE-2026-126495 mqttx: MQTTX: Arbitrary script execution via unescaped tooltips
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerability-draftAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in MQTTX. This vulnerability allows a remote attacker to execute arbitrary scripts within the desktop application by publishing crafted topic names or message payloads. Because the application fails to properly sanitize input displayed in user interface tooltips, the injected script executes when a user hovers over affected items in the topic or data tree view.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-11-11 01:11:20 UTC 
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.