Cross-Site Scripting (XSS) in MQTTX is an MQTT (CVE-2025-62413)
Summary
Cross-site scripting in MQTTX is an MQTT (CVE-2025-62413). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 1.12.1 or later.
Original description
The description as published by the source.
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.
Source: NIST National Vulnerability Database NVD
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2025-62413 has been found in MQTTX is an MQTT.
Risk of unauthorized operations or information disclosure. CVSS score: 6.1/10.
What to do: upgrade MQTTX is an MQTT to 1.12.1 or later.
If unsure, ask your IT team or search "MQTTX is an MQTT CVE-2025-62413" on the vendor's site.
CVE-2025-62413 (MQTTX is an MQTT) — CWE-79 / CVSS v3 6.1
Attack vector: remote (network-reachable) / unauthenticated
Patched: 1.12.1 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Cross-site scripting (XSS) (CWE-79) exists in MQTTX is an MQTT.
Check the vendor advisory for the affected versions of MQTTX is an MQTT.
Severity: Medium (CVSS 6.1/10). Risk of unauthorized operations or information disclosure.
Update to 1.12.1.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで MQTTX is an MQTT を使っているサービスとバージョンを洗い出す。
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2Apply patch patch
Upgrade MQTTX is an MQTT to 1.12.1ステージング環境で 1.12.1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。