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CVE-2026-84409— Lantronix G520 Series Cellular Gateway Cross-site Scripting

Quick assessment

Affected
Lantronix G520 Series
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

The device's update mechanism retrieves metadata for software updates over an unencrypted HTTP connection and stores portions of that metadata for later use. A management interface subsequently returns this stored value in a JSON response, and the web interfac

CVSS 7.5 · High
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I. Basic Information for CVE-2026-84409

Vulnerability Information

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Vulnerability Title
Lantronix G520 Series Cellular Gateway Cross-site Scripting
Source: CVE Program / CVE List V5
Vulnerability Description
The device's update mechanism retrieves metadata for software updates over an unencrypted HTTP connection and stores portions of that metadata for later use. A management interface subsequently returns this stored value in a JSON response, and the web interface responsible for displaying update information inserts that value directly into the page as HTML. This behavior allows attacker‑controlled metadata to be interpreted as script content. In addition, the same authenticated origin provides an interface capable of executing system‑level commands with root privileges. An attacker able to influence update metadata could exploit these conditions to execute arbitrary code within the administrative context of the device.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Lantronix G520 Series 2.6.0.4R6 stable -

II. Public POCs for CVE-2026-84409

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III. Intelligence Information for CVE-2026-84409

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Other References for CVE-2026-84409 (4)

IV. Related Vulnerabilities

Same product: G520 Series
Same vendor: Lantronix
Same weakness: CWE-79

V. Comments for CVE-2026-84409

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