What is CVE-2025-62413?

CVE-2025-62413 is a medium-severity vulnerability in Emqx Mqttx, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2025-10-16.

How severe is CVE-2025-62413?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Emqx Mqttx

CVE-2025-62413

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.003 (22.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Emqx Mqttx — versions = 1.12.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2025-62413?: CVE-2025-62413 is a medium-severity vulnerability in Emqx Mqttx, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2025-10-16.
How severe is CVE-2025-62413?: Medium severity. CVSS v3 base score is 6.1 out of 10.